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The total number of matches is 4163

Acabaria, Gray 1859 [Gorgonacea]
Acabaria mangyschlakensis, Kuzmicheva 1980 [Gorgonacea]
Acacia, P. Miller [Leguminosae]
Acacia bulbosa, Jordan 1997 [Leguminosae]
Acacia lamarensis, Knowlton 1899 [unclassified species]
Acacia macrosperma, Knowlton 1899 [unclassified species]
Acacia mahengense, Herendeen and Jacobs 2000 [Leguminosae]
Acacia wardii, Knowlton 1899 [unclassified species]
Acaciaephyllum, Fontaine 1889 [unclassified genus]
Acaciaephyllum longifolium, Fontaine 1889 [unclassified species]
Acaciaphyllites, Berry 1914 [unclassified genus]
Acaciaphyllites grevilleoides, Berry 1914 [unclassified species]
Acaciapollenites, D. C. Mindelhall 1972 [unclassified genus]
Acaciapollenites acaciae, Caccavari and Guler 2006 [Acaciapollenites]
Acaciapora, Moore and Jeffords 1945 [Pachyporidae]
Acaciaporella, Tchi 1980 [Anthozoa]
Acaciaporella jilinensis, Tchi 1980 [Anthozoa]
Acaciella, Walter 1972 [unclassified genus]
Acaciella australica, Walter et al. 2000 [Acaciella]
Acacioxylon, Schenk 1883 [unclassified genus]
Acacioxylon antiquum, Schenk 1883 [unclassified species]
Acacioxylon odonellii, Menéndez 1962 [Acacioxylon]
Acacioxylon tenax, Felix 1893 [unclassified species]
Acacocrinus, Wachsmuth and Springer 1897 [Monobathrida]
Acacocrinus latus, Springer 1928 [unclassified species]
Acadagnostus, Kobayashi 1939 [Diplagnostidae]
Acadagnostus acadicus (Hartt 1868) [Peronopsidae]
Acadagnostus argentinus, Harrington and Leanza 1957 [Diplagnostidae]
Acadagnostus transversus, Yang et al. 1993 [Spinagnostidae]
Acadiella, Sues and Baird 1998 [Procolophonidae]
Acadiella psalidodon, Sues and Baird 1998 [Procolophonidae]
Acadiocaris [Tanaidacea]
Acadolenus, Sdzuy 1967 [Ellipsocephalidae]
Acadoparadoxides, Green 1834 [Paradoxididae]
Acadoparadoxides briareus, Geyer 1993 [Paradoxididae]
Acadoparadoxides deani, Geyer and Vincent 2015 [Paradoxididae]
Acadoparadoxides harlani, Green 1834 [Paradoxididae]
Acadoparadoxides levisettii, Geyer and Vincent 2015 [Paradoxididae]
Acadoparadoxides mureroensis (Sdzuy 1958) [Paradoxididae]
Acadoparadoxides nobilis (Geyer 1998) [Paradoxididae]
Acadoparadoxides ovatopyge, Geyer and Vincent 2015 [Paradoxididae]
Acaena, Mutis and Linneaus 1771 [Rosaceae]
Acaenasuchus, Long and Murry 1995 [Reptilia]
Acaenasuchus geoffreyi, Long and Murry 1995 [Reptilia]
Acaeniospongus, Kozur and Mostler 1981 [Oertlispongidae]
Acaeniotyle, Foreman 1973 [Parvivaccidae]
Acaeniotyle diaphorogona, Foreman 1973 [Parvivaccidae]
Acaeniotyle gedrangta, Empson-Morin 1981 [Parvivaccidae]
Acaeniotyle ghostensis, Carter et al. 1988 [Parvivaccidae]
Acaeniotyle parva, Yang 1993 [Parvivaccidae]
Acaeniotyle rebellis, O'Dogherty 1994 [Parvivaccidae]
Acaeniotyle starka, Empson-Morin 1981 [Parvivaccidae]
Acaeniotyle umbilicata (Rüst 1898) [Parvivaccidae]
Acaeniotylidae, family, Yang 1993 [Spumellaria]
Acaeniotylinae, subfamily, Yang 1993 [Parvivaccidae]
Acaeniotylopsis, Kito and De Wever 1994 [Parvivaccidae]
Acaeniotylopsis ghostensis (Carter et al. 1988) [Parvivaccidae]
Acaeniotylopsis triacanthus, Kito and De Wever 1994 [Parvivaccidae]
Acaeniotylopsis variatus, Kito and De Wever 1994 [Parvivaccidae]
Acaeniotylopsis variatus triacanthus (Kito and De Wever 1994) [Parvivaccidae]
Acaenitinae, subfamily (Förster 1869) [Ichneumonidae]
Acaenitini, tribe, Förster 1869 [unclassified tribe]
Acaenitus, Latreille 1809 [Ichneumonidae]
Acaenolithus, M. Black 1973 [Arkhangelskiellaceae]
Acaenolithus cenomanica, M. Black 1973 [Arkhangelskiellaceae]
Acaenolithus galloisii, M. Black 1973 [Arkhangelskiellaceae]
Acaenolithus viriosa, J. Jeremiah 1996 [Arkhangelskiellaceae]
Acaenoplax, Sutton et al. 2001 [Mollusca]
Acaenoplax hayae, Sutton et al. 2001 [Acaenoplax]
Acalepha [Trachylinida]
Acallepitrix, Bechyné 1959 [Chrysomelidae]
Acalles, Schoenherr 1825 [Curculionidae]
Acalles exhumatus, Wickham 1913 [Curculionidae]
Acalles icarus, von Heyden and von Heyden 1866 [Curculionidae]
Acalles ruficollis, Broun 1893 [Curculionidae]
Acallomyia (Melander 1928) [Empididae]
Acallomyia probolaea, Melander 1949 [Empididae]
Acallosuchus, Long and Murry 1995 [Reptilia]
Acallosuchus rectori, Long and Murry 1995 [Reptilia]
Acalypha, Linnaeus [Euphorbiaceae]
Acalypha aequalis, MacGinitie 1941 [Euphorbiaceae]
Acalyptina, subtribe, Thomson 1859 [Curculionidae]
Acalyptini, tribe, Thomson 1859 [Curculionidae]
Acalyptomerinae, subfamily, R. A. Crowson 1979 [Clambidae]
Acalyptomerus, Crowson 1979 [unclassified genus]
Acalyptomerus thayerae, Cai and Lawrence 2019 [unclassified species]
Acalyptophis, Boulenger 1896 [unclassified genus]
Acalyptophis peronii (Duméril 1853) [unclassified species]
Acalyptopygus, Clarke and Oberprieler 2018 [unclassified genus]
Acalyptopygus astriatus, Clarke and Oberprieler 2018 [unclassified species]
Acalyptopygus brevicornis, Clarke and Oberprieler 2018 [unclassified species]
Acalyptopygus elongatus, Clarke and Oberprieler 2018 [unclassified species]
Acalyptopygus lingziae, Clarke and Oberprieler 2018 [unclassified species]
Acalyptratae, Macquart 1835 [Diptera]
Acalyptus, Schoenherr 1833 [Curculionidae]
Acalyptus obtusus, Scudder 1893 [Brentidae]
Acalyptus peronii, Duméril 1853 [unclassified species]
Acamana, Simpson et al. 1962 [Henricosborniidae]
Acamana ambiguus, Simpson et al. 1962 [Henricosborniidae]
Acambona [Retziidae]
Acampsohelcon, Tobias 1987 [Helconoidae]
Acampsohelcon rasnitzini, Tobias 1987 [Helconoidae]
Acampsohelconini, tribe, Tobias 1987 [Helconoidae]
Acamptini, tribe, Le Conte 1876 [Curculionidae]
Acamptochetus [Neogastropoda]
Acamptogenotia, Rovereto 1899 [Turridae]
Acamptogenotia (Acamptogenotia), Rovereto 1899 [unclassified subgenus]
Acamptogenotia (Acamptogenotia) nodulosa, Hickman 1976 [unclassified species]
Acamptogenotia (Acamptogenotia) tessellata, Hickman 1976 [unclassified species]
Acamptogenotia (Austrotoma) (Finlay 1924) [unclassified subgenus]
Acamptogenotia (Megasurcula) (Casey 1904) [unclassified subgenus]
Acamptonectes, Fischer et al. 2012 [Ophthalmosauridae]
Acamptonectes densus, Fischer et al. 2012 [Ophthalmosauridae]
Acamptus, Le Conte 1876 [Curculionidae]
Acamptus exilipes, Poinar and Legalov 2014 [Curculionidae]
Acandylacanthus, St. John and Worthen 1875 [Ctenacanthiformes]
Acanomyphoria, Guo 1985 [unclassified genus]
Acanomyphoria tuberosa, Guo 1985 [unclassified species]
Acanothyra [Hexactinellida]
Acantaloma (Conrad 1840) [Lichida]
Acanthacaris, Bate 1988 [Nephropidae]
Acanthaceae, family, A. L. de Jussieu 1789 [Scrophulariales]
Acanthactinella [Reticulosa]
Acanthaecites [Oppeliidae]
Acanthagnostus, Qian 1982 [Clavagnostidae]
Acanthagnostus longispinus, Qian 1982 [Clavagnostidae]
Acanthalepis, McCoy 1846 [Rhombifera]
Acanthalepis bispinatus, Pianovskij 1989 [Conodonta]
Acanthaloma, Conrad 1840 [Lichida]
Acanthaloma angelini, Prantl and Pribyl 1949 [unclassified species]
Acanthaloma mirka, Marek 1952 [Lichida]
Acanthalomina [Lichida]
Acanthalosia, Waterhouse 1986 [Strophalosiidae]
Acanthalosia concava (Maxwell 1954) [Strophalosiidae]
Acanthalosia deari (Briggs 1998) [Strophalosiidae]
Acanthalosia domina, Waterhouse 1986 [Strophalosiidae]
Acanthambonia, Cooper 1956 [Siphonotretidae]
Acanthambonia delicata, Holmer 1989 [unclassified species]
Acanthambonia klabavensis, Havlí?ek 1982 [unclassified species]
Acanthambonia minutisima, Cooper 1956 [unclassified species]
Acanthambonia minutissima, Cooper 1956 [unclassified species]
Acanthambonia portranensis, Wright 1963 [Siphonotretidae]
Acanthambonia virginiensis, Cooper 1956 [unclassified species]
Acanthamboniinae, subfamily, Cooper 1956 [Obolidae]
Acanthametropodidae, family, Edmunds 1963 [Ephemeroptera]
Acanthamoebidae, family [Amoebozoa]
Acantharia, class [Actinopoda]
Acantharodeia, C. Rovereto 1914 [Dasypodidae]
Acantharodeia scalabrinii (Moreno and Mercerat 1891) [Dasypodidae]
Acantharodeia spicata, C. Rovereto 1914 [Dasypodidae]
Acanthaspida, family, A. Heintz 1921 [unclassified family]
Acanthaspidi, suborder, Jaekel 1911 [unclassified suborder]
Acanthaspis, Newberry 1875 [Psammosteidae]
Acanthaspis, Amiot and Serville 1843 [unclassified genus]
Acanthaspis arctica, Heintz 1929 [Psammosteidae]
Acanthaster, Gervais 1841 [Archasteridae]
Acanthaster planci (Linnaeus 1758) [Archasteridae]
Acanthasteridae, family, Sladen 1889 [Valvatida]
Acanthastraea (Milne-Edwards and Haime 1848) [Mussidae]
Acanthastrea, Milne-Edwards and Haime 1848 [Mussidae]
Acanthastrea amakusensis, Veron 1990 [Mussidae]
Acanthastrea braziliensis, Verrill 1867 [Mussidae]
Acanthastrea crenulata (Meneghini 1868) [Mussidae]
Acanthastrea dausi, Chevalier 1961 [Mussidae]
Acanthastrea echinata (Dana 1846) [Mussidae]
Acanthastrea hemprichii (Ehrenberg 1834) [Mussidae]
Acanthastrea hillae, Wells 1955 [Mussidae]
Acanthastrea horrida (Reuss 1860) [Mussidae]
Acanthastrea lordhowensis, Veron and Pichon 1982 [Mussidae]
Acanthastrea patula (Dana 1846) [Diploastraeidae]
Acanthastrea polygonalis, Martin 1880 [Mussidae]
Acanthastrea termofurae, Chevalier 1961 [Mussidae]
Acanthastrella [Astrophorida]
Acanthastus, Kozlowski 1948 [Graptolithina]
Acanthatia, Muir-Wood and Cooper 1960 [Araksalosiidae]
Acanthatia nupera (Stainbrook 1947) [Araksalosiidae]
Acanthatia rangariensis, Campbell and Engel 1963 [Araksalosiidae]
Acanthatrigla, Gaemers 1984 [unclassified genus]
Acanthatrigla biangulata, Gaemers 1984 [unclassified species]
Acanthaulax, Sarjeant 1968 [unclassified genus]
Acanthaulax tenuiceras, Eisenack 1958 [Acanthaulax]
Acanthaxius, Sakai and Saint Laurent 1989 [unclassified genus]
Acanthaxius carinatus, Frantescu 2014 [Acanthaxius]
Acanthechinus [Phymosomatidae]
Acanthephyra, Milne-Edwards 1881 [Oplophoridae]
Acanthephyra acutifrons, Bate 1888 [Oplophoridae]
Acanthephyra curtirostris, Wood-Mason 1891 [Oplophoridae]
Acanthephyra quadrispinosa, Kemp 1939 [Oplophoridae]
Acanthephyra sica, Bate 1888 [Oplophoridae]
Acanthephyra smithi, Kemp 1939 [Oplophoridae]
Acantherpestes, Meek and Worthen 1868 [Euphoberiidae]
Acantherpestes brodiei, Scudder 1882 [Euphoberiidae]
Acantherpestes foveolatus, Fritsch 1899 [Euphoberiidae]
Acantherpestes giganteus, Baldwin 1911 [Euphoberiidae]
Acantherpestes gigas, Fritsch 1895 [Euphoberiidae]
Acantherpestes inequalis, Scudder 1890 [Euphoberiidae]
Acantherpestes major (Meek and Worthen 1868) [Euphoberiidae]
Acantherpestes ornatus, Fritsch 1899 [Euphoberiidae]
Acantherpestes vicinus, Fritsch 1899 [Euphoberiidae]
Acanthia, Fabricius 1775 [Cimicides]
Acanthia littoralis (Linnaeus 1758) [Saldides]
Acanthias, Leach 1814 [Squalidae]
Acanthias appendiculatus (Agassiz 1843) [Squalidae]
Acanthias geelongensis, Chapman and Pritchard 1904 [unclassified species]
Acanthias latidens (Davis 1887) [Squalidae]
Acanthichnus, Hitchcock 1858 [Ichnofossils]
Acanthichthys, Arratia and Chorn 1998 [Ferrifronsidae]
Acanthicus, Lundberg 1997 [Loricariidae]
Acanthidium, Lowe 1839 [Squalidae]
Acanthiidae, family, Leach 1815 [Hemiptera]
Acanthina, Fischer de Waldheim 1807 [Muricidae]
Acanthina, Korde 1973 [unclassified genus]
Acanthina (Chorus) (Gray 1847) [Thaisidae]
Acanthina (Chorus) sula (Olsson 1931) [Thaisidae]
Acanthina (Chorus) sula cruziana, Olsson 1932 [Thaisidae]
Acanthina katzi, Fleming 1972 [Muricidae]
Acanthina monodon (Pallas 1974) [Muricidae]
Acanthina multiformis, Korde 1973 [unclassified species]
Acanthina obesa, DeVries 2003 [Muricidae]
Acanthina rugosa, DeVries 2003 [Muricidae]
Acanthina triangularis, DeVries 2003 [Muricidae]
Acanthina unicornis (Bruguiére 1789) [Muricidae]
Acanthinites, E. v. Mojsisovics 1893 [Tibetitidae]
Acanthinites calypso, Mojsisovics 1893 [Tibetitidae]
Acanthinites eusebii, Diener 1920 [Tibetitidae]
Acanthinites excelsus, Mojsisovics 1893 [Tibetitidae]
Acanthinites magnificus (McLearn 1939) [Tibetitidae]
Acanthinocyathida, order, Okulitch 1935 [Regulares]
Acanthinocyathidae, family, Bedford and Bedford 1934 [Acanthinocyathida]
Acanthinocyathus, Bedford and Bedford 1936 [Acanthinocyathidae]
Acanthinopus, Pinna 1974 [Decapoda]
Acanthinopus gibbosus, Pinna 1974 [Decapoda]
Acanthinucella [Muricidae]
Acanthinucella mirabilis (Möricke 1896) [Muricidae]
Acanthinucella philippi (Möricke 1896) [Muricidae]
Acanthion, F. Cuvier 1823 [unclassified genus]
Acanthion brachyurus (Linnaeus 1758) [Acanthion]
Acanthionidae, family, Schulze 1900 [Lipotyphla]
Acanthis, Borkhausen 1797 [unclassified genus]
Acanthisittidae, family, Sundevall 1872 [Passeriformes]
Acanthizidae, family [Passeriformes]
Acanthobasiliola, Zezina 1981 [unclassified genus]
Acanthobasiliola doederleini, Davidson 1886 [Acanthobasiliola]
Acanthobatis, Larrazet 1866 [Myliobatiformes]
Acanthobolbina [Palaeocopida]
Acanthobotrys, Popofsky 1913 [Cannobotryidae]
Acanthocaetodon, Bleeker 1876 [Chaetodontidae]
Acanthocaetodon longirostrum, Casier 1966 [Chaetodontidae]
Acanthocardia, Gray 1851 [Cardiidae]
Acanthocardia (Acanthocardia), Gray 1851 [Cardiidae]
Acanthocardia (Acanthocardia) aculeata (Linnaeus 1758) [Cardiidae]
Acanthocardia (Acanthocardia) echinata (Linnaeus 1767) [Cardiidae]
Acanthocardia (Acanthocardia) echinatum (Linnaeus 1767) [Cardiidae]
Acanthocardia (Acanthocardia) kirkerensis (Clark 1918) [Cardiidae]
Acanthocardia (Agnocardia) (Stewart 1930) [Cardiidae]
Acanthocardia (Agnocardia) sorrentoense (Hanna 1927) [Cardiidae]
Acanthocardia (Schedocardia) (Stewart 1930) [Cardiidae]
Acanthocardia (Schedocardia) brewerii (Gabb 1864) [Cardiidae]
Acanthocardia (Schedocardia) brewerii hartleyensis (Clark and Woodford 1927) [Cardiidae]
Acanthocardia (Schedocardia) hatchetigbeensis (Aldrich 1886) [Cardiidae]
Acanthocardia (Schedocardia) tuomeyi (Aldrich 1886) [Cardiidae]
Acanthocardia afra, Gliozzi and Malatesta 1983 [Cardiidae]
Acanthocardia becksii (Muller 1847) [Cardiidae]
Acanthocardia brewerii (Gabb 1864) [Cardiidae]
Acanthocardia hanseata (Kautsky 1925) [Cardiidae]
Acanthocardia maputi, Gliozzi and Malatesta 1983 [Cardiidae]
Acanthocardia massintonti, Gliozzi and Malatesta 1983 [Cardiidae]
Acanthocardia mozambensis, Gliozzi and Malatesta 1983 [Cardiidae]
Acanthocardia rectispina (Koenen 1893) [Cardiidae]
Acanthocardia sorrentoensis (Hanna 1927) [Cardiidae]
Acanthocardiini, tribe [Cardiidae]
Acanthocarpus, Stimpson 1870 [Calappidae]
Acanthocarpus, Goeppert 1864 [unclassified genus]
Acanthocarpus obscurus (Rathbun 1918) [Calappidae]
Acanthocarpus osborni, Feldmann et al. 2019 [unclassified species]
Acanthocarpus xanthioides, Goeppert 1864 [unclassified species]
Acanthocassis, He and Xie 1989 [Sabelliditida]
Acanthocassis orthacanthus (Yang and He 1984) [Sabelliditida]
Acanthocaudina, Mostler 1970 [Holothuroidea]
Acanthocaudina exlinae, Mostler 1970 [Holothuroidea]
Acanthocella, Canu and Bassler 1917 [Cribrilinidae]
Acanthocella tubulifera (Hincks 1881) [Cribrilinidae]
Acanthocephala [Lemniscea]
Acanthocephalonotum, Petrulevicius and Popov 2014 [Discocephalidae]
Acanthocephalonotum martinsnetoi, Petrulevicius and Popov 2014 [Discocephalidae]
Acanthocephalus, Qiu 1983 [Trilobita]
Acanthocephalus longispinus, Qiu 1983 [unclassified species]
Acanthoceramoporella [Cystoporata]
Acanthoceras, Neumayr 1875 [Acanthoceratidae]
Acanthoceras (Mammites) (Laube and Bruder 1887) [unclassified subgenus]
Acanthoceras (Mammites) prenodosoides, Boule et al. 1907 [unclassified species]
Acanthoceras (Mantelliceras) (Hyatt 1903) [Acanthoceratidae]
Acanthoceras (Mantelliceras) falloti, Collignon 1931 [Acanthoceratidae]
Acanthoceras (Parahoplites) (Anthula 1899) [Parahoplitidae]
Acanthoceras (Parahoplites) gottschei, Kilian 1902 [Douvilleiceratidae]
Acanthoceras (Pedioceras) (Gerhardt 1897) [unclassified subgenus]
Acanthoceras (Pedioceras) jaekeli, Solger 1904 [unclassified species]
Acanthoceras (Prionotropis) (Meek 1876) [Collignoniceratidae]
Acanthoceras (Prionotropis) alluaudi, Boule et al. 1907 [Collignoniceratidae]
Acanthoceras (Pseudacanthoceras), Thomel 1972 [Acanthoceratidae]
Acanthoceras (Pseudacanthoceras) wintoni (Adkins 1928) [Acanthoceratidae]
Acanthoceras (Romaniceras) (Spath 1923) [Acanthoceratidae]
Acanthoceras aberrans, Kossmat 1895 [Acanthoceratidae]
Acanthoceras albertense, Warren 1930 [Acanthoceratidae]
Acanthoceras alvaradoense, Moreman 1942 [Acanthoceratidae]
Acanthoceras amphibolum, Morrow 1935 [Acanthoceratidae]
Acanthoceras amudariense, Arkhanguelsky 1916 [Acanthoceratidae]
Acanthoceras asiatica, Jimbo 1894 [Acanthoceratidae]
Acanthoceras athabascense, Warren and Stelck 1955 [Acanthoceratidae]
Acanthoceras bellense, Adkins 1928 [Acanthoceratidae]
Acanthoceras bigoureti, Seunes 1887 [Deshayesitidae]
Acanthoceras borgesi, Douville 1931 [Acanthoceratidae]
Acanthoceras calvertense, Powell 1963 [Acanthoceratidae]
Acanthoceras camachoense, Böse 1923 [unclassified species]
Acanthoceras camattei (d'Orbigny 1841) [unclassified species]
Acanthoceras chasca, Benavides-Caceres 1956 [Acanthoceratidae]
Acanthoceras coloradoensis, Henderson 1908 [Acanthoceratidae]
Acanthoceras compitalis, Stoyanow 1949 [Acanthoceratidae]
Acanthoceras compressum, Anderson 1902 [unclassified species]
Acanthoceras cunningtoni (Sharpe 1855) [Acanthoceratidae]
Acanthoceras cunningtoni inermis, Pervinquière 1907 [unclassified subspecies]
Acanthoceras cuspidum, Stephenson 1953 [Acanthoceratidae]
Acanthoceras discoidale, Kossmat 1895 [Acanthoceratidae]
Acanthoceras douvillei, Pervinquière 1907 [Acanthoceratidae]
Acanthoceras eschii, Solger 1904 [Acanthoceratidae]
Acanthoceras evolutum, Spath 1926 [Acanthoceratidae]
Acanthoceras flexuosum, Crick 1907 [Acanthoceratidae]
Acanthoceras folleatum (White 1887) [Acanthoceratidae]
Acanthoceras gadeni, Chudeau 1909 [Acanthoceratidae]
Acanthoceras gevreyi, Jacob 1907 [Prolyelliceratidae]
Acanthoceras gortanii, Venzo 1936 [Acanthoceratidae]
Acanthoceras gothicum, Kossmat 1895 [Acanthoceratidae]
Acanthoceras granerosense, Cobban and Scott 1972 [unclassified species]
Acanthoceras haughi, Pervinquiere 1907 [Acanthoceratidae]
Acanthoceras hazzardi, Stephenson 1952 [Acanthoceratidae]
Acanthoceras hirsutum, Parona and Bonarelli 1897 [Lyelliceratidae]
Acanthoceras indica, Kossmat 1895 [Acanthoceratidae]
Acanthoceras inermis, Pervinquière 1907 [Acanthoceratidae]
Acanthoceras johnsonianum, Stephenson 1955 [Acanthoceratidae]
Acanthoceras joserita, Stoyanow 1949 [Acanthoceratidae]
Acanthoceras jukesbrownei (Spath 1926) [Acanthoceratidae]
Acanthoceras justinae, Hill 1893 [Deshayesitidae]
Acanthoceras kallesi, Zázvorka 1958 [Acanthoceratidae]
Acanthoceras kanabense, Stanton 1894 [Acanthoceratidae]
Acanthoceras lecontei, Anderson 1958 [Acanthoceratidae]
Acanthoceras lyelli (d'Orbigny 1841) [Lyelliceratidae]
Acanthoceras mamillare (Schlotheim 1813) [Douvilleiceratidae]
Acanthoceras milletianum (d'Orbigny 1841) [Acanthoceratidae]
Acanthoceras milletianum elegans, Fritel 1906 [Parahoplitidae]
Acanthoceras mocambiquensis, Choffat 1903 [Acanthoceratidae]
Acanthoceras muldoonense, Cobban and Scott 1973 [Acanthoceratidae]
Acanthoceras newboldi, Kossmat 1897 [Acanthoceratidae]
Acanthoceras offarcinatum (White 1887) [Douvilleiceratidae]
Acanthoceras planecostata, Kossmat 1897 [Acanthoceratidae]
Acanthoceras pollocense, Benavides-Caceres 1956 [Acanthoceratidae]
Acanthoceras prorsocurvatum, Gerhardt 1897 [Prolyelliceratidae]
Acanthoceras pseudolyelli, Parona and Bonarelli 1897 [Lyelliceratidae]
Acanthoceras pseudonodosoides, Choffat 1898 [Acanthoceratidae]
Acanthoceras rhotomagense (Brongniart 1822) [Acanthoceratidae]
Acanthoceras rhotomagensis (Brongniart 1822) [Acanthoceratidae]
Acanthoceras ridzewskyi, Karakash 1897 [unclassified species]
Acanthoceras robustum, Crick 1907 [Acanthoceratidae]
Acanthoceras rotomagense (Brongniart 1822) [Acanthoceratidae]
Acanthoceras rotomagense judaica, Taubenhaus 1920 [Acanthoceratidae]
Acanthoceras sangalense, Benavides-Caceres 1956 [Acanthoceratidae]
Acanthoceras seunesi, Parona and Bonarelli 1896 [unclassified species]
Acanthoceras tarrantense (Adkins 1928) [unclassified species]
Acanthoceras turneri (White 1889) [unclassified species]
Acanthoceras ultimum, Marshall 1926 [Kossmaticeratidae]
Acanthoceras whitei, Matsumoto 1959 [unclassified species]
Acanthoceras wintoni, Adkins 1928 [Acanthoceratidae]
Acanthoceras woollgari (Mantell 1822) [Collignoniceratidae]
Acanthoceras worthense, Adkins 1918 [unclassified species]
Acanthoceras wyomingense (Reagan 1924) [unclassified species]
Acanthoceratacea, superfamily (de Grossouvre 1894) [Ammonitida]
Acanthocerataceae, superfamily, de Grossouvre 1894 [Ammonitida]
Acanthoceratidae, family, Grossouvre 1894 [Ammonitida]
Acanthoceratinae, subfamily, de Groussouvre 1894 [Acanthoceratidae]
Acanthoceratites, Schrammen 1928 [Ceratitidae]
Acanthoceratoidea, superfamily (de Grossouvre 1894) [Ammonitida]
Acanthoceridae, family [Coleoptera]
Acanthocerini, tribe () [unclassified tribe]
Acanthochaetetes, Fischer 1970 [Acanthochaetetidae]
Acanthochaetetes seunesi, Fischer 1970 [Acanthochaetetidae]
Acanthochaetetidae, family, Fischer 1970 [Hadromerida]
Acanthochelys, Gray 1873 [Chelidae]
Acanthochelys cosquinensis, de la Fuente 1992 [unclassified species]
Acanthochelys macrocephala, Rhodin et al. 1984 [unclassified species]
Acanthochelys pallidipectoris, Freiberg 1945 [unclassified species]
Acanthochelys radiolata, Mikan 1820 [unclassified species]
Acanthochelys spixii, Duméril and Bibron 1837 [unclassified species]
Acanthochermes, Kollar 1848 [Phylloxeridae]
Acanthochermes longirostris, Wegierek 2003 [Phylloxeridae]
Acanthochermesini, tribe, Börner 1913 [Phylloxeridae]
Acanthochirana, Strand 1928 [Aegeridae]
Acanthochirana angulata, Oppel 1862 [Aegeridae]
Acanthochirana cenomanica, M. Glaessner 1946 [Aegeridae]
Acanthochirana cenomanicus, Glaessner 1945 [Aegeridae]
Acanthochirana cordata, Munster 1839 [Aegeridae]
Acanthochirana krausei, Forster 1967 [Aegeridae]
Acanthochirana smithwoodwardi, V. Van Straelen 1940 [Aegeridae]
Acanthochirana triassica, Garassino et al. 2014 [Aegeridae]
Acanthochirus, Oppel 1862 [unclassified genus]
Acanthochirus longipes, Oppel 1862 [Aethridae]
Acanthochites, Leach 1826 [unclassified genus]
Acanthochites pygmaeus, Pilsbry 1893 [Acanthochitonidae]
Acanthochitina [Rhizopodea]
Acanthochitona, Gray 1821 [Acanthochitonidae]
Acanthochitona avicula, Carpenter 1864 [unclassified species]
Acanthochitona communis, Sabelli and Taviani 1979 [Acanthochitonidae]
Acanthochitona crinita (Pennant 1777) [Acanthochitonidae]
Acanthochitona fascicularis (Linnaeus 1758) [Acanthochitonidae]
Acanthochitona pygmaea (Pilsbry 1893) [Acanthochitonidae]
Acanthochitonidae, family, Pilsbry 1893 [Neoloricata]
Acanthochitonina, suborder, Bergenhayn 1930 [Neoloricata]
Acanthochitoninae, subfamily, Pilsbry 1893 [Acanthochitonidae]
Acanthocinini, tribe (Blanchard 1845) [unclassified tribe]
Acanthocinites, tribe, Blanchard 1845 [Cerambycidae]
Acanthocinus, Dejean 1821 [Cerambycidae]
Acanthocinus schmidti, Schmidt 1967 [Cerambycidae]
Acanthocircus, Squinabol 1903 [Saturnalidae]
Acanthocircus amissus (Squinabol 1914) [Saturnalidae]
Acanthocircus bispinus (Yao 1972) [Saturnalidae]
Acanthocircus breviaculeatus, Donofrio and Mostler 1978 [Saturnalidae]
Acanthocircus calvus, Dumitrica and Zügel 2008 [Saturnalidae]
Acanthocircus carinatus, Foreman 1973 [Saturnalidae]
Acanthocircus dicranacanthos, Squinabol [Saturnalidae]
Acanthocircus dumitricai, Kiessling 1999 [Saturnalidae]
Acanthocircus echinocircus, Dumitrica and Zügel 2008 [Saturnalidae]
Acanthocircus euganeus (Squinabol 1914) [Saturnalidae]
Acanthocircus furiosus, Jud 1994 [Saturnalidae]
Acanthocircus gracilis (Kozur and Mostler 1972) [Saturnalidae]
Acanthocircus hexagonus (Yao 1972) [Saturnalidae]
Acanthocircus hueyi (Pessagno 1976) [Saturnalidae]
Acanthocircus italicus (Squinabol 1914) [Saturnalidae]
Acanthocircus minimus (Squinabol 1914) [Saturnalidae]
Acanthocircus moctezumaensis, Yang 1993 [Saturnalidae]
Acanthocircus preclarus (Foreman 1975) [Saturnalidae]
Acanthocircus prinevillensis, Blome 1984 [Saturnalidae]
Acanthocircus protoformis (Yao 1972) [Saturnalidae]
Acanthocircus rotundus, Blome 1984 [Saturnalidae]
Acanthocircus simplex (Squinabol 1914) [Saturnalidae]
Acanthocircus spelae, Dumitrica and Zügel 2008 [Saturnalidae]
Acanthocircus spinifer (Campbell and Clark 1944) [Saturnalidae]
Acanthocircus suboblongus (Yao 1972) [Saturnalidae]
Acanthocircus tenuispinosus (Donofrio and Mostler 1978) [Saturnalidae]
Acanthocircus trizonalis (Rüst 1898) [Saturnalidae]
Acanthocircus tympanum, O'Dogherty 1994 [Saturnalidae]
Acanthocircus variabilis (Squinabol 1914) [Saturnalidae]
Acanthocircus venetus (Squinabol 1914) [Saturnalidae]
Acanthocircus yaoi, Yang 1993 [Saturnalidae]
Acanthocladia, King 1849 [Acanthocladiidae]
Acanthocladia anceps (Schlotheim 1820) [Acanthocladiidae]
Acanthocladia biserialis, Chronic 1949 [Acanthocladiidae]
Acanthocladia diffusa (Korn 1930) [Acanthocladiidae]
Acanthocladia dubia (Schlotheim 1820) [Acanthocladiidae]
Acanthocladia guadalupensis, Girty 1909 [Acanthocladiidae]
Acanthocladia laxa, Korn 1930 [Acanthocladiidae]
Acanthocladia minor, Korn 1930 [Acanthocladiidae]
Acanthocladia multipora, Fritz 1932 [Acanthocladiidae]
Acanthocladia ouachitensis, Harlton 1933 [Acanthocladiidae]
Acanthocladia regularis, Bassler 1929 [Acanthocladiidae]
Acanthocladia rhombicellata, Schulga-Nesterenko 1955 [Acanthocladiidae]
Acanthocladia sparsifurcata, Schulga-Nesterenko 1939 [Acanthocladiidae]
Acanthocladia thaiensis, Sakagami 1968 [Acanthocladiidae]
Acanthocladia tumulosa, Morozova 1970 [Acanthocladiidae]
Acanthocladia tundrica, Kruchinina 1986 [Acanthocladiidae]
Acanthocladiidae, family, Zittel 1880 [Fenestrida]
Acanthocladiinae, subfamily, Zittel 1880 [Acanthocladiidae]
Acanthocladus, Yang 2006 [Emplectopteridaceae]
Acanthocladus xyloides, Yang 2006 [Emplectopteridaceae]
Acanthoclava [Problematica]
Acanthoclema [Nikiforovellidae]
Acanthoclinidae, family [Kurtiformes]
Acanthoclymenia, Hyatt 1900 [Acanthoclymeniidae]
Acanthoclymenia forcipifer (Sandberger and Sandberger 1850) [Acanthoclymeniidae]
Acanthoclymenia forcipifera (Sandberger and Sandberger 1850) [Acanthoclymeniidae]
Acanthoclymenia genundewa (Clarke 1898) [Acanthoclymeniidae]
Acanthoclymenia neapolitana (Clarke 1892) [Acanthoclymeniidae]
Acanthoclymenia planorbis (Sandberger and Sandberger 1851) [Acanthoclymeniidae]
Acanthoclymeniidae, family, Schindewolf 1955 [Agoniatitida]
Acanthoclymeniinae, subfamily, Schindewolf 1955 [unclassified subfamily]
Acanthocnemidae, family, Crowson 1952 [Coleoptera]
Acanthocnemoides, Zherikhin 1977 [Acanthocnemidae]
Acanthocnemoides sukatshevae, Zherikhin 1977 [Acanthocnemidae]
Acanthocnemus, Perris 1866 [Acanthocnemidae]
Acanthocoenia, D'Orbigny 1850 [Stylinidae]
Acanthocoenia neocomiensis, Volz 1903 [Stylinidae]
Acanthocordylodus [Phragmodontidae]
Acanthocoryna, Finks 1960 [Docodermatidae]
Acanthocoryna stauroma, Finks 1960 [Docodermatidae]
Acanthocosta [Productidae]
Acanthocrania, Williams 1943 [Craniidae]
Acanthocrania alta, Cooper and Grant 1974 [Craniidae]
Acanthocrania conferta, Cooper and Grant 1974 [Craniidae]
Acanthocrania cracentis, Wright 1963 [Craniidae]
Acanthocrania densispina, Cooper and Grant 1974 [Craniidae]
Acanthocrania elusa, Cocks 2014 [Craniidae]
Acanthocrania intermedia, Cooper and Grant 1974 [Craniidae]
Acanthocrania magna, Cooper and Grant 1974 [Craniidae]
Acanthocrania minutispinosa, Cooper and Grant 1974 [Craniidae]
Acanthocrania nordtimanica, Kalashnikov 1993 [Craniidae]
Acanthocrania platys, Cooper and Grant 1974 [Craniidae]
Acanthocrania regularis, Cooper and Grant 1974 [Craniidae]
Acanthocrania setigera (Hall 1866) [unclassified species]
Acanthocrania setigeria (Hall 1866) [unclassified species]
Acanthocrania spiculata (Rowley 1908) [Craniidae]
Acanthocrania vasta, Cooper and Grant 1974 [Craniidae]
Acanthocrinus, F. A. Roemer 1850 [Diplobathrida]
Acanthocrinus benedettoi, Haude 2004 [Diplobathrida]
Acanthocryptus, Thomas [Ichneumonidae]
Acanthocryptus bischoffi, Statz 1936 [Ichneumonidae]
Acanthocyathus, Milne-Edwards and Haime 1848 [Caryophylliidae]
Acanthocyathus grayi, Milne-Edwards and Haime 1848 [Caryophylliidae]
Acanthocyathus malayicus, Gerth 1923 [Caryophylliidae]
Acanthocyathus spinosa, Umbgrove 1950 [unclassified species]
Acanthocyathus transilvanicus, Reuss 1871 [Caryophylliidae]
Acanthocyathus vindobonensis, Reuss 1871 [Caryophylliidae]
Acanthocyatus (Milne-Edwards and Haime 1848) [Caryophylliidae]
Acanthocybiinae, subfamily, Starks 1910 [Scombridae]
Acanthocybium, Gill 1862 [Scombridae]
Acanthocybium proosti, Storms 1897 [Scombridae]
Acanthocybium solandri (Cuvier 1831) [Scombridae]
Acanthocyclus, Dybowski 1873 [Paleocyclidae]
Acanthocyclus catinulus, Dybowski 1873 [Paleocyclidae]
Acanthocyclus fletcheri (Milne-Edwards and Haime 1851) [Paleocyclidae]
Acanthocyclus iowensis, Bassler 1937 [Paleocyclidae]
Acanthocyclus magnus, Bassler 1937 [Paleocyclidae]
Acanthocyclus parvulus, Bassler 1937 [Paleocyclidae]
Acanthocyclus porpitoides, Lang and Smith 1927 [Paleocyclidae]
Acanthocystites, Barrande 1887 [Eocrinoidea]
Acanthocystites briareus, Barrande 1887 [Eocrinoidea]
Acanthocythere [Podocopida]
Acanthocythereis [Podocopida]
Acanthocythereis hystrix, Reuss 1850 [Podocopida]
Acanthocythereis presequenta, Benson 1977 [unclassified species]
Acanthocythereis washburni (Stephenson 1944) [unclassified species]
Acanthodactylus, Wiegmann 1834 [unclassified genus]
Acanthodactylus erythurus, Schinz 1833 [unclassified species]
Acanthodei, order, Gunnell 1933 [Selachii]
Acanthodelphis (Gray 1866) [Phocoenidae]
Acanthodelphis spinipennis (Burmeister 1865) [Phocoenidae]
Acanthodelphis spinipinnis (Burmeister 1865) [Phocoenidae]
Acanthoderes, Audinet-Serville 1835 [Cerambycidae]
Acanthoderes lengii, Wickham 1914 [Cerambycidae]
Acanthoderes phrixi, Heer 1847 [Cerambycidae]
Acanthoderini, tribe, Thomson 1860 [Cerambycidae]
Acanthoderma, Agassiz 1843 [unclassified genus]
Acanthoderma orbiculatum, Heer 1865 [unclassified species]
Acanthoderma ovale, Agassiz 1842 [unclassified species]
Acanthoderma spinosum, Agassiz 1842 [unclassified species]
Acanthoderus (Audinet-Serville 1835) [Cerambycidae]
Acanthoderus lepidus, Heer 1865 [Cerambycidae]
Acanthoderus sepultus, Heer 1865 [Cerambycidae]
Acanthodes, Agassiz 1843 [Plagiostomi]
Acanthodes affinis, Whiteaves 1887 [Plagiostomi]
Acanthodes australis, Woodward 1906 [unclassified species]
Acanthodes beecheri, Eastman 1902 [unclassified species]
Acanthodes bridgei, Zidek 1976 [unclassified species]
Acanthodes bronni (Agassiz 1832) [unclassified species]
Acanthodes concinnus, Whiteaves 1887 [Plagiostomi]
Acanthodes gracilis, Beyrich 1949 [unclassified species]
Acanthodes guizhouensis, Wang and Turner 1985 [Plagiostomi]
Acanthodes marshi, Eastman 1902 [unclassified species]
Acanthodes mitchelli, Egerton 1861 [Plagiostomi]
Acanthodes nitidus, Woodward 1891 [Plagiostomi]
Acanthodes ovensis, White 1927 [unclassified species]
Acanthodes peachi, Egerton 1861 [Plagiostomi]
Acanthodes pristis, Clarke 1885 [unclassified species]
Acanthodes punctatus, Fritsch 1893 [unclassified species]
Acanthodes pusillus, Agassiz 1844 [Plagiostomi]
Acanthodes pygmaeus, Fritsch 1875 [Plagiostomi]
Acanthodes rouvillei, Sauvage 1883 [Plagiostomi]
Acanthodes semistriatus, Woodward 1892 [unclassified species]
Acanthodes sulcatus, Agassiz 1835 [unclassified species]
Acanthodes wardi, Egerton 1866 [Plagiostomi]
Acanthodesia [Membraniporidae]
Acanthodesia bifossata, Brown 1952 [Membraniporidae]
Acanthodesia quadrilatera, Canu and Bassler 1935 [Membraniporidae]
Acanthodesia regularis, Canu and Bassler 1935 [Membraniporidae]
Acanthodesmia, Müller 1857 [Acanthodesmiidae]
Acanthodesmia, Prinada 1962 [unclassified genus]
Acanthodesmia setacea, Prinada 1962 [unclassified species]
Acanthodesmiacea, superfamily, Hertwig 1879 [Nassellaria]
Acanthodesmiidae, family, Hertwig 1879 [Nassellaria]
Acanthodi, order (Owen 1846) [unclassified order]
Acanthodi, suborder, Jaekel 1911 [unclassified suborder]
Acanthodiacrodium, Timofeev 1958 [Acritarcha]
Acanthodiacrodium dentiferum, Timofeev 1958 [unclassified species]
Acanthodiaulax, Schweitzer et al. 2003 [Xandarocarcinidae]
Acanthodiaulax mclayi, Schweitzer et al. 2003 [Xandarocarcinidae]
Acanthodictya [Reticulosa]
Acanthodictyon, Handlirsch 1906 [Dictyoneuridae]
Acanthodictyon decheni (Goldenberg 1854) [Dictyoneuridae]
Acanthodida, order, Berg 1940 [Acanthodii]
Acanthodidae, family, Huxley 1861 [Acanthodiformes]
Acanthodiformes, order, Berg 1940 [Acanthodii]
Acanthodii, class, Owen 1846 [Teleostomi]
Acanthodii, subclass (Owen 1846) [unclassified subclass]
Acanthodii (Owen 1846) [unclassified]
Acanthodii, order (Owen 1846) [unclassified order]
Acanthodina [Conodontophorida]
Acanthodiplatys, Ren et al. 2018 [unclassified genus]
Acanthodiplatys leptocercus, Ren et al. 2018 [unclassified species]
Acanthodiscus, Uhlig 1905 [Neocomitidae]
Acanthodiscus [Bacillariophyceae]
Acanthodiscus lamberti, Sayn 1907 [Neocomitidae]
Acanthodiscus magnificus, Imlay 1938 [Neocomitidae]
Acanthodiscus radiatus (Bruguiére 1792) [Neocomitidae]
Acanthodiscus subradiatus, Uhlig 1910 [Neocomitidae]
Acanthodontidae, family, Lindström 1970 [unclassified family]
Acanthodopsis, Hancock and Atthey 1868 [Acanthoessidae]
Acanthodopsis microdon, Traquair 1894 [unclassified species]
Acanthodopsis wardi, Hancock and Atthey 1868 [Acanthoessidae]
Acanthodoris, Gray 1850 [unclassified genus]
Acanthodrepanites, Tozer 1994 [Tibetitidae]
Acanthodrepanites dieneri, Tozer 1994 [Tibetitidae]
Acanthodrepanites eusebii (Diener 1920) [Tibetitidae]
Acanthodromia, A. Milne-Edwards 1880 [unclassified genus]
Acanthodromia erinacea, A. Milne-Edwards 1880 [unclassified species]
Acanthodromia zannatoi, Beschin et al. 2016 [unclassified species]
Acanthodus [Conodontophorida]
Acanthodus uncinatus, Furnish 1938 [unclassified species]
Acanthodus uncinctus (Furnish 1938) [unclassified species]
Acanthoessidae, family, Hay 1902 [Acanthodei]
Acanthoessus, Agassiz 1843 [Acanthoessidae]
Acanthoessus affinis (Whiteaves 1887) [unclassified species]
Acanthoessus bronni, Agassiz 1832 [Plagiostomi]
Acanthoessus concinnus (Whiteaves 1887) [unclassified species]
Acanthoessus pristis (Clarke 1885) [unclassified species]
Acanthoessus semistriatus (Woodward 1892) [unclassified species]
Acanthogalathea (Muller and Collins 1991) [Galatheidae]
Acanthogalathea broglioi, Beschin et al. 2016 [unclassified species]
Acanthogalathea devecchii, Beschin et al. 2016 [unclassified species]
Acanthogalathea feldmanni, De Angeli and Garassino 2002 [Galatheidae]
Acanthogalathea parva (Muller and Collins 1991) [Galatheidae]
Acanthogalathea paucispinosa, Beschin et al. 2016 [unclassified species]
Acanthogalathea squamosa, Beschin et al. 2007 [Galatheidae]
Acanthogammaridae, family [Amphipoda]
Acanthoglossus, Gervais 1877 [Tachyglossidae]
Acanthoglossus goodfellowi, Thomas 1907 [Tachyglossidae]
Acanthoglypha [Clarkellidae]
Acanthognathus, Duncker 1912 [Syngnathidae]
Acanthognathus, Mayr 1887 [Formicidae]
Acanthognathus incolumis, Danil'chenko 1960 [Syngnathidae]
Acanthognathus poinari, Baroni Urbani 1994 [Formicidae]
Acanthognathus squalidus, Danil'chenko 1960 [Syngnathidae]
Acanthograptidae, family, Bulman 1938 [unclassified family]
Acanthograptus [Dendroidea]
Acanthograptus sinensis, Hsü 1948 [unclassified species]
Acanthogyra, Ogilvie 1897 [Rhipidogyridae]
Acanthogyra aptiana, Turnsek and Mihajlovic 1981 [Rhipidogyridae]
Acanthogyra columnaris, Ogilvie 1897 [Rhipidogyridae]
Acanthogyra micra, Eliasova 1973 [Rhipidogyridae]
Acanthogyra multiformis, Ogilvie 1897 [Rhipidogyridae]
Acanthogyra paracolumnaris, Sikharulidze 1979 [Rhipidogyridae]
Acanthogyra tosaensis, Eguchi 1951 [Rhipidogyridae]
Acanthohalysites, Hamada 1957 [Halysitidae]
Acanthohelea, Kieffer 1917 [Ceratopogonidae]
Acanthohoplites, Sinzow 1908 [Deshayesitidae]
Acanthohoplites (Nolaniceras) () [Deshayesitidae]
Acanthohoplites (Nolaniceras) uhligi (Anthula 1899) [Deshayesitidae]
Acanthohoplites aschiltaensis (Anthula 1899) [Deshayesitidae]
Acanthohoplites berkleyi, Stoyanow 1949 [Deshayesitidae]
Acanthohoplites bigoureti (Seunes 1887) [Deshayesitidae]
Acanthohoplites erraticus, Stoyanow 1949 [Deshayesitidae]
Acanthohoplites hesper, Stoyanow 1949 [Deshayesitidae]
Acanthohoplites impetrabilis, Stoyanow 1949 [Deshayesitidae]
Acanthohoplites laticostatus, Sinzow 1908 [unclassified species]
Acanthohoplites schucherti, Stoyanow 1949 [Deshayesitidae]
Acanthohoplites teres, Stoyanow 1949 [Deshayesitidae]
Acanthohoplitinae, subfamily (Stoyanow 1949) [unclassified subfamily]
Acantholabis, Mao et al. 2020 [unclassified genus]
Acantholabis coralloides, Mao et al. 2020 [unclassified species]
Acantholabrus, Valenciennes 1839 [Labridae]
Acantholambrus, Blow and Manning 1996 [Parthenopidae]
Acantholambrus baumi, Blow and Manning 1996 [Parthenopidae]
Acantholaminatus [Trepostomida]
Acantholenus, Matthew 1898 [Trilobita]
Acantholepis, Pianovskij 1989 [Conodonta]
Acantholepis, Newberry 1875 [unclassified genus]
Acantholepis pustulosus, Newberry 1875 [unclassified species]
Acantholipan, Rivera-Sylva et al. 2018 [unclassified genus]
Acantholipan gonzalezi, Rivera-Sylva et al. 2018 [unclassified species]
Acantholyda, Costa 1894 [Hymenoptera]
Acantholyda caplani (Cockerell 1933) [Hymenoptera]
Acantholyda erythrocephala (Linnaeus 1758) [Hymenoptera]
Acantholyda grangeoni, Riou 1999 [Hymenoptera]
Acantholyda ribesalbesensis, Peñalver and Arillo 2002 [Hymenoptera]
Acantholytoceras, Spath 1932 [Crioceratitidae]
Acantholytoceras subcirculare (Avram 2002) [Crioceratitidae]
Acanthomantispa, Lu et al. 2020 [unclassified genus]
Acanthomantispa grandis, Lu et al. 2020 [unclassified species]
Acanthomantispa immaculata, Lu et al. 2020 [unclassified species]
Acanthomantispa maculata, Lu et al. 2020 [unclassified species]
Acanthomeridion, Hou et al. 1989 [Archaeocopida]
Acanthomeridion, Hou et al. 1989 [Ostracoda]
Acanthomeridion serratum, Hou et al. 1989 [Archaeocopida]
Acanthometopus, Lu and Qian 1983 [Ptychopariida]
Acanthomicmacca, Hupé 1953 [Chengkouiidae]
Acanthomicmacca (Acanthomicmacca), Hupé 1953 [Chengkouiidae]
Acanthomicmacca (Acanthomicmacca) franconica, Geyer 2016 [Chengkouiidae]
Acanthomicmacca cylindrica (Qian and Yao 1974) [unclassified species]
Acanthomicmacca ellipsocephaloides (Cobbold 1910) [Chengkouiidae]
Acanthomicmacca walcotti (Mathew 1899) [Chengkouiidae]
Acanthomorpha, order, Rosen 1973 [Actinopteri]
Acanthomorpha (Rosen 1973) [Actinopteri]
Acanthomorphata (Rosen 1973) [Actinopteri]
Acanthomyites, Cockerell 1921 [Diptera]
Acanthomyites aldrichi, Cockerell 1921 [Diptera]
Acanthonautilus, Foord 1896 [Solenochilidae]
Acanthonema, Sherzer and Grabau 1910 [Euomphalidae]
Acanthonema holopiforme, Sherzer and Grabau 1910 [Euomphalidae]
Acanthonema holopiformis (Sherzer and Grabau 1910) [Euomphalidae]
Acanthonema laxa, Sherzer and Grabau 1910 [Euomphalidae]
Acanthonema newberryi (Meek 1871) [Euomphalidae]
Acanthonematidae, family (Wenz 1938) [Sorbeoconcha]
Acanthonematinae, subfamily, Wenz 1938 [Sorbeoconcha]
Acanthonemidae, family [Perciformes]
Acanthonemus, Agassiz 1835 [Acanthonemidae]
Acanthonemus filamentosus, Agassiz 1835 [Acanthonemidae]
Acanthonemus subaureus, Blainville 1818 [Acanthonemidae]
Acanthonotos, Sauvage 1870 [unclassified genus]
Acanthonotos alatus, Sauvage 1870 [Perciformes]
Acanthonotos armatus, Sauvage 1870 [unclassified species]
Acanthonotos licatae, Sauvage 1870 [Perciformes]
Acanthonotus, Cuvier 1800 [Perciformes]
Acanthonotus armatus, Sauvage 1873 [Perciformes]
Acanthoparypha, Whittington and Evitt 1953 [Cheiruridae]
Acanthoparypha chiropyga, Whittington and Evitt 1953 [Cheiruridae]
Acanthoparypha echinoderma, Chatterton and Ludvigsen 1976 [Cheiruridae]
Acanthoparypha evetti (Chatterton and Ludvigsen 1976) [unclassified species]
Acanthoparypha evitti, Chatterton and Ludvigsen 1976 [Cheiruridae]
Acanthoparypha goniopyga, Ludvigsen 1979 [Cheiruridae]
Acanthoparypha perforata, Whittington and Evitt 1953 [Cheiruridae]
Acanthoparypha projecta, Esker 1961 [Cheiruridae]
Acanthoparypha subcircularis (Bradley 1930) [Cheiruridae]
Acanthoparyphinae, subfamily, Whittington and Evitt 1953 [Cheiruridae]
Acanthopecten, Girty 1903 [Limipectinidae]
Acanthopecten anshunensis, Xu 1980 [Limipectinidae]
Acanthopecten bellosum, Hoare et al. 1978 [Limipectinidae]
Acanthopecten carboniferous (Stevens 1858) [Limipectinidae]
Acanthopecten carboniferus (Stevens 1858) [Limipectinidae]
Acanthopecten chitralensis, Reed 1925 [Heteropectinidae]
Acanthopecten coloradoensis (Newberry 1861) [Limipectinidae]
Acanthopecten delawarensis (Girty 1909) [Limipectinidae]
Acanthopecten equicostatus, Xu 1980 [Limipectinidae]
Acanthopecten gaoanensis, Li and Ding 1982 [Limipectinidae]
Acanthopecten giganteus, Chen et al. 1974 [Limipectinidae]
Acanthopecten jaguelensis, Gonzalez 1997 [Limipectinidae]
Acanthopecten josephinae (Gemmellaro 1896) [Limipectinidae]
Acanthopecten laqueatus (Girty 1909) [Heteropectinidae]
Acanthopecten licharewi (Fredericks 1915) [Limipectinidae]
Acanthopecten meeki, Newell 1938 [Limipectinidae]
Acanthopecten ohioensis, Mark 1912 [Euchondriidae]
Acanthopecten onukii, Murata 1964 [Limipectinidae]
Acanthopecten shenshuensis, Liang 1980 [Limipectinidae]
Acanthopecten spinosus, Hayasaka 1925 [Limipectinidae]
Acanthopecten subgiganteus, Xu 1980 [Limipectinidae]
Acanthopecten xizangensis, Liu 1976 [Limipectinidae]
Acanthopecten ziphocostatus, Liu 1976 [Limipectinidae]
Acanthopectinidae, family, Newell and Boyd 1995 [Limipectinidae]
Acanthopectininae, subfamily (Newell and Boyd 1995) [Limipectinidae]
Acanthopectinini, tribe, Newell and Boyd 1995 [Limipectinidae]
Acanthophiceras, Diener 1916 [Ophiceratidae]
Acanthophiceras gibbosum (Griesbach 1880) [Ophiceratidae]
Acanthophillia [Anthozoa]
Acanthophillipsia, Yuan et al. 1992 [Phillipsiidae]
Acanthophillipsia abnormis, Yuan et al. 1992 [Phillipsiidae]
Acanthophillipsia abrota, Yuan et al. 1992 [Phillipsiidae]
Acanthophillipsia densigranulata (Kobayashi and Hamada 1984) [Phillipsiidae]
Acanthophillipsia felicitae, Fortey and Heward 2015 [Phillipsiidae]
Acanthophillipsia granulosa, Yuan et al. 1992 [Phillipsiidae]
Acanthophillipsia guiyangensis, Yuan et al. 1992 [Phillipsiidae]
Acanthopholidae, family (Nopcsa 1902) [Reptilia]
Acanthopholidae, subfamily (Nopcsa 1902) [Reptilia]
Acanthopholididae, family, Nopcsa 1902 [Reptilia]
Acanthopholinae, subfamily (Nopcsa 1902) [Reptilia]
Acanthopholis, Huxley 1867 [Reptilia]
Acanthopholis curtonotus (Seeley 1879) [Nodosauridae]
Acanthopholis eucercus, Seeley 1879 [Reptilia]
Acanthopholis eucerus (Seeley 1879) [unclassified species]
Acanthopholis horrida (J. W. Huxley 1867) [Reptilia]
Acanthopholis horridus, J. W. Huxley 1867 [Reptilia]
Acanthopholis macrocercus, Seeley 1869 [Reptilia]
Acanthopholis major (H. G. Seeley 1878) [Reptilia]
Acanthopholis platypus, Seeley 1869 [Reptilia]
Acanthopholis stereocercus, H. G. Seeley 1869 [Reptilia]
Acanthophora [Astrophorida]
Acanthophyllia, Wells 1937 [Mussidae]
Acanthophyllia ampla (Reuss 1871) [Mussidae]
Acanthophyllia deshayesiana (Michelin 1850) [Mussidae]
Acanthophyllites, Grand'Eury 1890 [unclassified genus]
Acanthophyllites nicolai, Grand'Eury 1890 [unclassified species]
Acanthophyllum, Dybowski 1873 [Ptenophyllidae]
Acanthophyllum (Grypophyllum), Birenheide 1961 [Ptenophyllidae]
Acanthophyllum (Grypophyllum) jenkinsi, Strusz 1966 [Ptenophyllidae]
Acanthophyllum (Neostringophyllum) (Wedekind 1922) [Ptenophyllidae]
Acanthophyllum clermontense (Etheridge 1911) [Ptenophyllidae]
Acanthophyllum clermontensis (Etheridge 1911) [Ptenophyllidae]
Acanthophyllum confusum, Birenheide and Soto 1992 [Ptenophyllidae]
Acanthophyllum trompetti, Coen-Aubert 2013 [Ptenophyllidae]
Acanthophyton, Dawson 1862 [unclassified genus]
Acanthophyton spinosum, Dawson 1862 [unclassified species]
Acanthoplecta [Productellidae]
Acanthoplecta inopinata, Carter 1967 [unclassified species]
Acanthopleura, Guilding 1829 [Chitonidae]
Acanthopleurella, Groom 1902 [Ptychopariida]
Acanthopleurella meridionalis, Henderson 1983 [unclassified species]
Acanthopleurinae, subfamily, Thiele 1910 [Chitonidae]
Acanthopleuroceras, Hyatt 1900 [Polymorphitidae]
Acanthopleuroceras actaeon (d'Orbigny 1844) [Polymorphitidae]
Acanthopleuroceras arietiforme (Oppel 1853) [Polymorphitidae]
Acanthopleuroceras arietiformis, Oppel 1853 [unclassified species]
Acanthopleuroceras calliplocoides, Spath 1923 [Polymorphitidae]
Acanthopleuroceras carinatum (Quenstedt 1885) [Polymorphitidae]
Acanthopleuroceras inflatum (Quenstedt 1885) [Polymorphitidae]
Acanthopleuroceras lepidum, Tutcher and Trueman 1925 [Polymorphitidae]
Acanthopleuroceras maugenesti (d'Orbigny 1844) [Polymorphitidae]
Acanthopleuroceras rursicosta, Buckman 1918 [Polymorphitidae]
Acanthopleuroceras stahli (Oppel 1856) [Polymorphitidae]
Acanthopleuroceras subarietiforme (Futterer 1893) [Polymorphitidae]
Acanthopleuroceras thomsoni, Smith and Tipper 1996 [Polymorphitidae]
Acanthopleuroceras valdani (d'Orbigny 1844) [Polymorphitidae]
Acanthopleuroceras viligaensis, Tuchkov 1954 [Amaltheidae]
Acanthopleuroceras whiteavesi, Smith and Tipper 1988 [Polymorphitidae]
Acanthopleuroceratidae, family (Arkell 1950) [Polymorphitidae]
Acanthopleuroceratinae, subfamily, Arkell 1950 [Polymorphitidae]
Acanthopleurus, Agassiz 1843 [Xenacanthidae]
Acanthoplites (Sinzow 1908) [Deshayesitidae]
Acanthoplites (Hypacanthoplites) (Spath 1923) [Parahoplitidae]
Acanthoplites (Hypacanthoplites) falloti, Collignon 1962 [Parahoplitidae]
Acanthoplites acutecosta, Riedal 1934 [Deshayesitidae]
Acanthoplites adkinsi, Humphrey 1949 [unclassified species]
Acanthoplites belohasifakaensis, Collignon 1962 [Deshayesitidae]
Acanthoplites bigoureti (Seunes 1887) [Deshayesitidae]
Acanthoplites gargasensis (d'Orbigny 1841) [Deshayesitidae]
Acanthoplites gargasensis aptiensis, Roch 1926 [Deshayesitidae]
Acanthoplites gargasensis recticostata, Kilian 1913 [Deshayesitidae]
Acanthoplites manerensis, Collignon 1962 [Deshayesitidae]
Acanthoplites midoensis, Collignon 1962 [Deshayesitidae]
Acanthoplites mitiensis, Collignon 1962 [Deshayesitidae]
Acanthoplites nolani (Seunes 1887) [Deshayesitidae]
Acanthoplites soaranensis, Collignon 1962 [Deshayesitidae]
Acanthoplites trifurcatus, Collignon 1962 [Deshayesitidae]
Acanthoplites venustus, Collignon 1962 [Deshayesitidae]
Acanthoplitinae, subfamily, Stoyanow 1949 [Deshayesitidae]
Acanthopora [Cyclostomata]
Acanthoporella [Cheilostomata]
Acanthoporidea [Cheilostomata]
Acanthoportunus, Schweitzer and Feldmann 2002 [Portunidae]
Acanthoportunus buchanani, Schweitzer and Feldmann 2002 [Portunidae]
Acanthoproductus [Productidae]
Acanthopsis, Agassiz 1843 [unclassified genus]
Acanthopsychops, Badano and Engel 2018 [unclassified genus]
Acanthopsychops triaina, Badano and Engel 2018 [unclassified species]
Acanthopteri, order [unclassified order]
Acanthopteris, Sze 1931 [unclassified genus]
Acanthopteris gothani, Sze 1931 [unclassified species]
Acanthopterygii, superorder [Actinopteri]
Acanthopterygii, suborder () [Actinopteri]
Acanthopterygii, order () [unclassified order]
Acanthoptychoceras, Manolov 1962 [Ancyloceratidae]
Acanthoptychoceras spinatocostatum, Manolov 1962 [Ancyloceratidae]
Acanthopygaeus, Leriche 1906 [Siganidae]
Acanthopygaeus agassizi, Eastman 1904 [Siganidae]
Acanthopyge, Hawle and Corda 1847 [Lichidae]
Acanthopyge (Acanthopyge), Hawle and Corda 1847 [Lichidae]
Acanthopyge (Acanthopyge) haueri (Barrande 1846) [Lichidae]
Acanthopyge (Jasperia), Thomas and Holloway 1988 [unclassified subgenus]
Acanthopyge (Jasperia) bifida (Edgell 1955) [unclassified species]
Acanthopyge (Lobopyge) (P?ibyl and Erben 1952) [Lichidae]
Acanthopyge (Lobopyge) australiformis, Chatterton et al. 1979 [Lichidae]
Acanthopyge (Lobopyge) australis (McCoy 1876) [Lichidae]
Acanthopyge (Lobopyge) balliviani (Kozlowski 1923) [Lichidae]
Acanthopyge (Lobopyge) bassei, Chatterton and Gibb 2010 [unclassified species]
Acanthopyge (Lobopyge) branikensis (Barrande 1872) [Lichidae]
Acanthopyge (Lobopyge) brankiensis (Barrande 1872) [Lichidae]
Acanthopyge (Lobopyge) brevis (Maksimova 1968) [Lichidae]
Acanthopyge (Lobopyge) campbelli, Chatterton and Wright 1986 [Lichidae]
Acanthopyge (Lobopyge) consanguinea (Clarke 1894) [Lichidae]
Acanthopyge (Lobopyge) decheni (Holzapfel 1895) [Lichidae]
Acanthopyge (Lobopyge) docekali (Vanek 1959) [Lichidae]
Acanthopyge (Lobopyge) edgecombei, Ebach 2001 [Lichidae]
Acanthopyge (Lobopyge) hirsuta (Fletcher 1850) [unclassified species]
Acanthopyge (Lobopyge) parapleura, Curtis and Lane 1998 [unclassified species]
Acanthopyge (Lobopyge) parvulus (Novák 1890) [unclassified species]
Acanthopyge (Lobopyge) pragensis (Bou?ek 1933) [unclassified species]
Acanthopyge (Lobopyge) pristina, Campbell and Chatterton 2006 [unclassified species]
Acanthopyge (Lobopyge) sinuata (Ratte 1886) [unclassified species]
Acanthopyge (Lobopyge) uralensis (Maksimova 1979) [Lichidae]
Acanthopyge (Mephiarges), Richter and Richter 1930 [unclassified subgenus]
Acanthopyge (Mephiarges) bifida, Edgell 1955 [unclassified species]
Acanthopyge (Mephiarges) mephisto (Richter and Richter 1918) [unclassified species]
Acanthopyge (Nipponarges) (Kaneko 1984) [unclassified subgenus]
Acanthopyge (Perunaspis) (P?ibyl 1949) [unclassified subgenus]
Acanthopyge (Perunaspis) helga, P?ibyl et al. 1986 [unclassified species]
Acanthopyge (Perunaspis) longispina (P?ibyl 1949) [unclassified species]
Acanthopyge (Perunaspis) longispinus (P?ibyl 1949) [unclassified species]
Acanthopyge (Perunaspis) minuta (Barrande 1846) [unclassified species]
Acanthopyge (Perunaspis) sexlobata (Roemer 1855) [unclassified species]
Acanthopyge consanguinea (Clarke 1894) [Lichidae]
Acanthopyge contusus (Hall and Clarke 1888) [unclassified species]
Acanthopyge decheni (Holzapfel 1895) [Lichidae]
Acanthopyge erbeni, Meischner 1965 [unclassified species]
Acanthopyge granulosa (Roemer 1852) [unclassified species]
Acanthopyge haueri (Barrande 1846) [Lichidae]
Acanthopyge haueri uralensis, Maksimova 1979 [Lichidae]
Acanthopyge parvula (Novák 1890) [unclassified species]
Acanthopyginae, subfamily, Erben 1952 [unclassified subfamily]
Acanthopyle [Spumellaria]
Acanthopyrgus, R.C. Handfield 1967 [Capsulocyathida]
Acanthopyrgus yukonensis, R.C. Handfield 1967 [Capsulocyathida]
Acanthoraphis [Poecilosclerida]
Acanthorhachis, Martill et al. 2014 [Listracanthidae]
Acanthorhachis spinatus (Bolton 1896) [Listracanthidae]
Acanthorhaphe, Ksiazkiewicz 1970 [Ichnofossils]
Acanthorhina, Fraas 1910 [Myriacanthidae]
Acanthorhina jaekeli, Fraas 1910 [Myriacanthidae]
Acanthorhinidae, family, Patterson 1965 [Chimaeriformes]
Acanthorhinus, Blainville 1816 [Squalidae]
Acanthorhynchia, Buckman 1917 [Acanthothirididae]
Acanthorhynchia (Acanthorhynchia), Buckman 1918 [Acanthothirididae]
Acanthorhynchia (Acanthorhynchia) panacanathina (Buckman and Walker 1918) [Acanthothirididae]
Acanthorhynchia (Acanthorhynchia) spinulosa (Oppel 1857) [Acanthothirididae]
Acanthorhynchia (Acanthorhynchia) vilsensis, Childs 1969 [Acanthothirididae]
Acanthorhynchia (Echinirhynchia), Childs 1969 [Acanthothirididae]
Acanthorhynchia (Echinirhynchia) lorioli (Rollier 1917) [Acanthothirididae]
Acanthorhynchia (Echinirhynchia) senticosa (Schlotheim 1820) [Acanthothirididae]
Acanthorhynchia (Echinirhynchia) setosa, Thomson and Owen 1979 [Acanthothirididae]
Acanthorhynchia nikitinensis, Gerassimov 1955 [Acanthothirididae]
Acanthorhynchia panacanathina, Buckman and Walker 1918 [Acanthothirididae]
Acanthorhynchia panacanthina (Buckman and Walker 1889) [Acanthothirididae]
Acanthorhynchia senticosa (Schlotheim 1820) [Acanthothirididae]
Acanthorhynchiinae, subfamily, Shi and Grant 1993 [Acanthothirididae]
Acanthorota, Kozur and Mostler 2008 [Paleochiridotidae]
Acanthorota permiana, Kozur and Mostler 2008 [Paleochiridotidae]
Acanthorthis, Neuman 1976 [Platystrophiidae]
Acanthorthis terreneuvensis, Neuman 1976 [Platystrophiidae]
Acanthorytidodiacrodium, Timofeev 1959 [unclassified genus]
Acanthoscapha, Ulrich and Bassler 1923 [Beecherellidae]
Acanthoscapha blessi, Kozur 1985 [Beecherellidae]
Acanthoscapha blumenstengeli, Kozur 1985 [Beecherellidae]
Acanthoscapha bogschi, Kozur 1970 [Beecherellidae]
Acanthoscapha devonica, Kesling and Sohn 1958 [unclassified species]
Acanthoscapha mersinella, Forel 2017 [unclassified species]
Acanthoscapha takacsae, Kozur 1985 [Beecherellidae]
Acanthoscapha veghae, Kozur 1970 [Beecherellidae]
Acanthoscapha veghea, Kozur 1970 [Beecherellidae]
Acanthoscaphites, Nowak 1911 [Scaphitidae]
Acanthoscaphites albertensis, Warren 1930 [Scaphitidae]
Acanthoscaphites dupliconodosus, Coryell and Salmon 1934 [Scaphitidae]
Acanthoscaphites nodosus (Owen 1852) [Scaphitidae]
Acanthoscaphites nodosus crassus, Coryell and Salmon 1934 [Scaphitidae]
Acanthoscaphites plenus (Meek and Hayden 1861) [Scaphitidae]
Acanthoscaphites tridens (Kner 1848) [Scaphitidae]
Acanthoscaphites verneuilianus (d'Orbigny 1841) [Scaphitidae]
Acanthoscelidina, subtribe (Bridwell 1946) [unclassified subtribe]
Acanthoscelidini, tribe, Bridwell 1946 [Chrysomelidae]
Acanthoschizorota, Kozur and Mostler 2008 [Paleochiridotidae]
Acanthoschizorota variabilis, Kozur and Mostler 2008 [Paleochiridotidae]
Acanthoscorpio, Kjellesvig-Waering 1986 [Acanthoscorpionidae]
Acanthoscorpio mucronatus, Kjellesvig-Waering 1986 [Acanthoscorpionidae]
Acanthoscorpionidae, family, Kjellesvig-Waering 1986 [Scorpiones]
Acanthoscorpionoidea, superfamily, Kjellesvig-Waering 1986 [Scorpiones]
Acanthoscyllium, Cappetta 1980 [Orectolobiformes]
Acanthosoma, Curtis 1824 [Acanthosomatidae]
Acanthosoma debile, Förster 1891 [Acanthosomatidae]
Acanthosoma joursacensis, Piton 1933 [Acanthosomatidae]
Acanthosoma livida, Heer 1853 [Acanthosomatidae]
Acanthosoma maculata, Heer 1853 [Acanthosomatidae]
Acanthosoma morloti, Heer 1853 [Acanthosomatidae]
Acanthosomatidae, family, Signoret 1864 [Hemiptera]
Acanthosphaera, Ehrenberg 1859 [Actinommidae]
Acanthosphaera, Duan 1984 [Problematica]
Acanthosphaera austriaca, Kozur and Mostler 1979 [Actinommidae]
Acanthosphaera awaensis, Nakaseko and Nishimura 1979 [Pentactinocarpidae]
Acanthosphaera echinus, Duan 1984 [Actinommidae]
Acanthosphaera hexagona, Rüst 1898 [Praeconocaryommidae]
Acanthosphaera magnimamma, Rüst 1898 [Parvivaccidae]
Acanthosphaera mocki, Kozur and Mostler 1979 [Actinommidae]
Acanthosphaera multispinosa, Kozur and Mostler 1979 [Pyramispongiidae]
Acanthospira, Weller 1914 [Gerkispiridae]
Acanthospirifer [Delthyrididae]
Acanthospirina, Schuchert and LeVene 1929 [Gerkispiridae]
Acanthospongia [Lyssacinosida]
Acanthostega, Jarvik 1952 [Acanthostegidae]
Acanthostega, Levinsen 1902 [Cheilostomata]
Acanthostega gunnari, Jarvik 1952 [Acanthostegidae]
Acanthostegidae, family, Jarvik 1952 [Stegocephali]
Acanthostegomorpha, infraorder (Levinsen 1902) [Cheilostomata]
Acanthostichini, tribe, Emery 1901 [Formicidae]
Acanthostichus, Mayr 1887 [Formicidae]
Acanthostichus hispaniolicus, de Andrade 1998 [Formicidae]
Acanthostictoporella, Ernst 2010 [Stictoporellidae]
Acanthostictoporella angusta, Ernst and Königshof 2010 [Stictoporellidae]
Acanthostoma, Credner 1883 [Zatracheidae]
Acanthostoma vorax, Credner 1883 [Zatracheidae]
Acanthostomatidae, family, Steen [unclassified family]
Acanthostomatops, Kuhn 1961 [Zatracheidae]
Acanthostomatops vorax (Credner 1883) [Zatracheidae]
Acanthostomi, order, Jaekel 1911 [unclassified order]
Acanthostrophia, Conti and Fischer 1984 [Protorculidae]
Acanthostrophia acanthica, Conti and Fischer 1984 [Protorculidae]
Acanthosura, Hardwicke and Gray 1827 [unclassified genus]
Acanthotelson, Meek and Worthen 1860 [Acanthotelsonidae]
Acanthotelsonidae, family, Pruvost 1919 [Malacostraca]
Acanthoteuthis, Wagner in Munster 1839 [Belemnitida]
Acanthoteuthis antiquus (Pearce 1847) [unclassified species]
Acanthoteuthis conocauda (Quenstedt 1849) [unclassified species]
Acanthoteuthis ferussacii, Munster 1839 [unclassified species]
Acanthoteuthis jaeckeli, Naef 1922 [unclassified species]
Acanthoteuthis leichi, Reitner 1986 [unclassified species]
Acanthoteuthis lictensteinii, Munster 1839 [unclassified species]
Acanthoteuthis mayri, Engeser and Reitner 1981 [unclassified species]
Acanthoteuthis montefiorei (Buckman 1880) [unclassified species]
Acanthoteuthis polonica, Markowski 1952 [unclassified species]
Acanthoteuthis scutellaris (Muenster 1842) [Muensterellidae]
Acanthoteuthis speciosa, Munster 1839 [unclassified species]
Acanthoteuthis syriaca (Roger 1944) [unclassified species]
Acanthotheca, Vendrasco et al. 2011 [Stenothecidae]
Acanthotheca junior (Runnegar 1996) [Stenothecidae]
Acanthotheelia, Frizzell and Exline 1955 [Myriotrochidae]
Acanthotheelia angustiperforata, Mostler 1971 [Myriotrochidae]
Acanthotheelia anisica, Mostler 1968 [Myriotrochidae]
Acanthotheelia diffissa, Mostler 1972 [Myriotrochidae]
Acanthotheelia helios, Kozur and Mock 1972 [Myriotrochidae]
Acanthotheelia ladinica, Kozur and Mostler 1971 [Myriotrochidae]
Acanthotheelia pseudospinosa, Kozur and Mock 1972 [Myriotrochidae]
Acanthotheelia pulchra, Kozur and Mock 1972 [Myriotrochidae]
Acanthotheelia rhaetica, Kristan-Tolmann 1964 [Myriotrochidae]
Acanthotheelia spiniperforata, Zawidzka 1971 [Kuehnitidae]
Acanthotheelia spinosa, Frizzell and Exline 1955 [Myriotrochidae]
Acanthotheelia triassica, Speckmann 1968 [Myriotrochidae]
Acanthotheelia veghae, Kozur and Mostler 1971 [Myriotrochidae]
Acanthothetidites, Tatzreiter 1980 [Thetiditidae]
Acanthothetidites spinosus, Tatzreiter 1980 [Thetiditidae]
Acanthothirididae, family, Schuchert 1913 [Rhynchonellida]
Acanthothiridinae, subfamily, Schuchert 1913 [Acanthothirididae]
Acanthothiris, d'Orbigny 1849 [Acanthothirididae]
Acanthothiris bisinuata, Babanova 1966 [Acanthothirididae]
Acanthothiris costata (Orbigny 1850) [Acanthothirididae]
Acanthothiris doultingensis, Richardson and Walker 1907 [Zeilleriidae]
Acanthothiris elargata, Seifert 1963 [Acanthothirididae]
Acanthothiris gibberosa, Kamyshan 1973 [Acanthothirididae]
Acanthothiris globosa, Buckman 1917 [Acanthothirididae]
Acanthothiris inflata (Quenstedt 1868) [Acanthothirididae]
Acanthothiris multispinosa, Seifert 1963 [Acanthothirididae]
Acanthothiris prima, Kamyshan 1973 [Acanthothirididae]
Acanthothiris quenstedti, Babanova 1966 [Acanthothirididae]
Acanthothiris sentosa (Quenstedt 1868) [Acanthothirididae]
Acanthothiris spinosa (Linnaeus 1767) [Acanthothirididae]
Acanthothiris subglobosa, Seifert 1963 [Acanthothirididae]
Acanthothoraci, order, Stensiö 1944 [Placodermi]
Acanthothoraciformes, order [Placodermi]
Acanthothyris, d'Orbigny 1850 [unclassified genus]
Acanthothyris lorioli, Rollier 1917 [Acanthothirididae]
Acanthothyris panacanthina, Buckman and Walker 1889 [Acanthothirididae]
Acanthothyris senticosa (Schlotheim 1820) [Acanthothirididae]
Acanthothyris senticosa fileyensis, Buckman and Walker 1889 [Acanthothirididae]
Acanthothyris spinosa, Linnaeus 1788 [Acanthothirididae]
Acanthothyris zieteni, Rollier 1917 [Acanthothyris]
Acanthothyropsis, Kamyshan 1973 [Acanthothirididae]
Acanthothyropsis costulata, Kamyshan 1973 [Acanthothirididae]
Acanthothyropsis crossi (Walker 1869) [Acanthothirididae]
Acanthotoechia [Polytoechiidae]
Acanthotoechia hibernica, Williams and Curry 1985 [Polytoechiidae]
Acanthotoposaurus, Evans and van den Heever 1987 [Reptilia]
Acanthotoposaurus bremneri, Evans and van den Heever 1987 [Reptilia]
Acanthotretella, Holmer and Caron 2006 [Eucoelomata]
Acanthotretella spinosa, Holmer and Caron 2006 [Eucoelomata]
Acanthotrichaphis, Shaposhnikov and Wegierek 1989 [Oviparosiphidae]
Acanthotrichaphis paulisensoriata, Shaposhnikov and Wegierek 1989 [Oviparosiphidae]
Acanthotrigonia, van Hoepen 1929 [Megatrigoniidae]
Acanthotrigonia higoensis, Tamura and Tashiro 1967 [Megatrigoniidae]
Acanthotrigonia mashikensis, Tamura and Tashiro 1967 [Megatrigoniidae]
Acanthotrigonia mifunensis, Tamura and Tashiro 1967 [Megatrigoniidae]
Acanthotrigonia shepstonei (Griesbach 1871) [unclassified species]
Acanthotriletes, Potonié and Kremp 1954 [Lycophyta]
Acanthotriletes varispinosus, Pocock 1962 [Acanthotriletes]
Acanthotrophia (Conti and Fischer 1984) [Gastropoda]
Acanthotrophon, Hertlein and Strong 1951 [Muricidae]
Acanthotropis, Radabaugh 1942 [Neritopsidae]
Acanthotropis megalacantha, Radabaugh 1942 [Neritopsidae]
Acanthotropis typica, Radabaugh 1942 [Neritopsidae]
Acanthotropites, Tozer 1994 [Tropitidae]
Acanthotropites racklaensis, Tozer 1994 [Tropitidae]
Acanthotrypa [Trepostomida]
Acanthotrypina [Trepostomida]
Acanthoxenophora, Perrilliat and Vega 2001 [Xenophoridae]
Acanthoxenophora sinuosa, Perrilliat and Vega 2001 [Xenophoridae]
Acanthozonodiacrodium, Timofeev 1959 [unclassified genus]
Acanthracochaerilus, Kjellesvig-Waering 1986 [Centromachidae]
Acanthracochaerilus palustris, Kjellesvig-Waering 1986 [Centromachidae]
Acanthuridae, family [Acanthuriformes]
Acanthuriformes, order [Actinopteri]
Acanthuriformes () [Actinopteri]
Acanthurinae, subfamily [Acanthuridae]
Acanthuroidei, suborder [Perciformes]
Acanthuroides, Blot and Tyler 1990 [Acanthuridae]
Acanthuroides massalongoi, Blot and Tyler 1990 [Acanthuridae]
Acanthurus, Forskal 1775 [Acanthuridae]
Acanthurus canossae, Heckel 1856 [Acanthuridae]
Acanthurus gaudryi, de Zigno 1887 [Acanthuridae]
Acanthurus gazolae, Massalongo 1859 [Acanthuridae]
Acanthurus haueri (Meyer 1842) [Squamata]
Acanthurus ovalis, Agassiz 1842 [Acanthuridae]
Acanthurus tenuis, Agassiz 1842 [Acanthuridae]
Acantinella, Shuto 1969 [unclassified genus]
Acantinella javana (Martin 1879) [unclassified species]
Acantonodella, Zaspelova 1952 [Drepanellidae]
Acanus, Agassiz 1839 [unclassified genus]
Acanus arcuatus, Agassiz 1839 [Acanus]
Acanus minor, Agassiz 1839 [Acanus]
Acanus oblongus, Agassiz 1839 [Acanus]
Acanus ovalis, Agassiz 1839 [Acanus]
Acanus regley, Agassiz 1839 [Acanus]
Acar, Gray 1857 [Arcidae]
Acar bailyi (Bartsch 1931) [Arcidae]
Acar celleporacea (Tate 1886) [Arcidae]
Acar congenita (Smith 1885) [unclassified species]
Acar domingensis (Lamarck 1819) [Arcidae]
Acar lamellosa (Deshayes 1858) [Arcidae]
Acar plicata (Dillwyn 1817) [Arcidae]
Acar reticulata (Gmelin 1792) [Arcidae]
Acar rostrae (S. S. Berry 1954) [Arcidae]
Acar sandersonae, Powell 1933 [Arcidae]
Acarechimys, Patterson 1965 [Rodentia]
Acarechimys constans (Ameghino 1887) [unclassified species]
Acarechimys gracilis (Ameghino 1891) [unclassified species]
Acarechimys leucotheae, Vucetich et al. 2015 [Rodentia]
Acarechimys minutissimus, F. Ameghino 1887 [Rodentia]
Acarechimys minutus, Patterson and Pascual 1967 [unclassified species]
Acarechimys pascuali, Verzi et al. 2017 [unclassified species]
Acarechimys pulchellus (Ameghino 1902) [Rodentia]
Acaremyidae, family (A. E. Wood 1949) [Rodentia]
Acaremyinae, subfamily, F. Ameghino 1902 [Rodentia]
Acaremys, Ameghino 1887 [Acaremyidae]
Acaremys karaikensis, Ameghino 1891 [Acaremyidae]
Acaremys major, Scott 1905 [Acaremyidae]
Acaremys messor, Ameghino 1889 [Acaremyidae]
Acaremys minutissimus, Ameghino 1887 [Acaremyidae]
Acaremys minutus, Ameghino 1887 [Acaremyidae]
Acaremys murinus, Ameghino 1887 [Acaremyidae]
Acaremys preminutus, Bordas 1939 [Acaremyidae]
Acaremys scagliai, Patterson 1971 [unclassified species]
Acaremys tricarinatus, Ameghino 1894 [Acaremyidae]
Acareorthis [Chileidae]
Acaretyrricula, Jin and Chatterton 1997 [Triplesiidae]
Acaretyrricula tenuiguttae, Jin and Chatterton 1997 [Triplesiidae]
Acari, subclass, Leach 1817 [Arachnida]
Acariaeocrinus, Biese 1935 [Crinoidea]
Acariaiocrinus, Wanner 1924 [Cladida]
Acaricoris, Harris and Drake 1948 [Aradiens]
Acaricoris robertae, Heiss and Poinar 2012 [Aradiens]
Acarictis, Gingerich and Deutsch 1989 [Hyaenodontidae]
Acarictis ryani, Gingerich and Deutsch 1989 [Hyaenodontidae]
Acaridae, family (Latreille 1802) [Acariformes]
Acaridiae, family, Latreille 1802 [Chelodonta]
Acariformes, superorder, Zakhvatkin 1952 [Arachnida]
Acariformes, order (Zakhvatkin 1952) [Arachnida]
Acarina, subclass (Leach 1817) [Arachnida]
Acarinina [Foraminifera]
Acarinina centralis (Cushman and Bermúdez 1937) [unclassified species]
Acaroceras, Chen et al. 1979 [Acaroceratidae]
Acaroceratidae, family, Chen et al. 1979 [Ellesmerocerida]
Acaroidea, superfamily, Latreille 1802 [Acariformes]
Acaromorpha, Dubinin 1957 [Arachnida]
Acartophthalmidae, family, Czerny 1928 [Diptera]
Acartophthalmites, Hennig 1965 [Diptera]
Acartophthalmites clusioides, Rohacek 2016 [Diptera]
Acartophthalmites tertiaria, Hennig 1965 [Diptera]
Acartophthalmites willii, Pérez-de la Fuente et al. 2018 [unclassified species]
Acartophthalmus, Czerny 1902 [Acartophthalmidae]
Acarus, Linnaeus 1758 [Acaridae]
Acarus resinosus, Presl 1822 [Arachnida]
Acarus rhombeus, Koch and Berendt 1854 [Glaesacaridae]
Acassidites, Haupt 1950 [Chrysomelidae]
Acassidites separandus, Haupt 1950 [Chrysomelidae]
Acasta, Leach 1817 [Archaeobalanidae]
Acasta cyathus, Darwin 1854 [Archaeobalanidae]
Acasta vesiculosa, Carriol 2008 [unclassified species]
Acastava, Richter 1954 [Acastidae]
Acastavinae, subfamily, Struve 1958 [unclassified subfamily]
Acaste, Goldfuss 1843 [Acastidae]
Acaste andersoni, Edgecombe 2007 [Acastidae]
Acaste birminghamensis, Norford 1972 [unclassified species]
Acaste downingiae (Murchison 1839) [Acastidae]
Acaste exilis, Eichwald 1858 [Pterygometopidae]
Acastea, Yang 1993 [Parvivaccidae]
Acastea acer, Yang 1993 [Parvivaccidae]
Acastea bipes, Yang 1993 [Parvivaccidae]
Acastea diaphorogona (Foreman 1973) [Parvivaccidae]
Acastea minispinea, Yang 1993 [Parvivaccidae]
Acastella, Reed 1925 [Acastidae]
Acastellina, Richter and Richter 1975 [Phacopida]
Acastidae, family, D. M. Delo 1935 [Phacopida]
Acastinae, subfamily, Delo 1935 [Dalmanitidae]
Acastocephala, Shergold 1966 [unclassified genus]
Acastocephala macrops (Salter 1864) [unclassified species]
Acastoidea, superfamily, Reijers 1972 [Trilobita]
Acastoides, Delo 1935 [Acastidae]
Acastoides haddadi, Chatterton et al. 2006 [unclassified species]
Acastoides zguilmensis, Chatterton et al. 2006 [unclassified species]
Acastopyge, Tomczykowa and Tomczyk 1970 [Phacopida]
Acathoceras (Mammites), Laube and Bruder 1887 [unclassified subgenus]
Acavidae, family, Pilsbry 1895 [Gastropoda]
Acavoidea, superfamily, Pilsbry 1895 [Gastropoda]
Acbastaucrinus, Sisova 1979 [Floricyclidae]
Acbastaucrinus affectatus, Sisova 1988 [Floricyclidae]
Accardia, Cresta 1997 [Hammatoceratidae]
Accardia diadematoides (Mayer 1871) [Hammatoceratidae]
Accardia eximia (Prinz 1904) [Hammatoceratidae]
Accardia noszkyi (Geczy 1966) [Hammatoceratidae]
Accidenticulabrum, G. Vermeij 2000 [Buccinidae]
Accidenticulabrum sangiranensis (Martin 1906) [Buccinidae]
Accintisporites, Leschik 1955 [Gymnospermophyta]
Accintisporites legatus, Leschik 1955 [Accintisporites]
Accipenseridae, family [Acipenseriformes]
Accipiter, M. J. Brisson 1760 [Accipitridae]
Accipiter cooperi (Bonaparte 1828) [Accipitridae]
Accipiter cooperii (Bonaparte 1828) [unclassified species]
Accipiter efficax, Balouet and Olson 1989 [unclassified species]
Accipiter fasciatus (Vigors and Horsfield 1827) [unclassified species]
Accipiter gentilis (Linnaeus 1758) [unclassified species]
Accipiter haplochrous, Sclater 1859 [unclassified species]
Accipiter madagascariensis, Verreaux 1833 [unclassified species]
Accipiter nisus (Linnaeus 1758) [unclassified species]
Accipiter novaehollandiae (Gmelin 1788) [unclassified species]
Accipiter quartus, Balouet and Olson 1989 [unclassified species]
Accipiter rufitorques (Peale 1848) [unclassified species]
Accipiter striatus, Vieillot 1897 [Accipitridae]
Accipiter striatus velox (Wilson 1812) [unclassified subspecies]
Accipiter tachiro (Daudin 1800) [unclassified species]
Accipiter trivigatus (Temminck 1824) [unclassified species]
Accipiter trivirgatus (Temminck 1824) [unclassified species]
Accipiter velox (Wilson 1812) [unclassified species]
Accipitres, suborder, Linnaeus 1758 [Falconiformes]
Accipitres (Linnaeus 1758) [unclassified]
Accipitridae, family, Viellot 1816 [Falconiformes]
Accipitriformes, order, Vieillot 1816 [Aves]
Accipitrinae, subfamily [Accipitridae]
Accipitrini, tribe, del Hoyo et al. 2014 [unclassified tribe]
Accipitroidea, superfamily [Falconiformes]
Acclinoplicatounio (Ma and Huang 1979) [unclassified genus]
Accordiella [Pfenderinidae]
Accretonemoura, Sinitshenkova 1987 [Perlariopseidae]
Accretonemoura grata, Sinitshenkova 1987 [Perlariopseidae]
Accretonemoura radiata, Sinitshenkova 1987 [Perlariopseidae]
Acculina, Misius and Ushatinskaya 1977 [Leptellinidae]
Acculina acculica, Misius and Ushatinskaya 1977 [Leptellinidae]
Acculina kulanketpesica, Popov et al. 2002 [Leptellinidae]
Acculina phyaliformis (Klenina 1984) [Leptellinidae]
Accurganaxon [Anthozoa]
Acdalina, Leleshus and Ospanova 1979 [Anthozoa]
Acdalopora, Bondarenko 1958 [Plasmoporellidae]
Acdemonini, tribe, Faust 1898 [unclassified tribe]
Acdestinae, subfamily [Palaeothentidae]
Acdestis, F. Ameghino 1887 [Palaeothentidae]
Acdestis elatus, Ameghino 1891 [Palaeothentidae]
Acdestis lemairei, Bown and Fleagle 1993 [Palaeothentidae]
Acdestis oweni, Ameghino 1887 [Palaeothentidae]
Acdestis owenii (Ameghino 1887) [Palaeothentidae]
Acdestis parvus, Ameghino 1891 [Palaeothentidae]
Acella, Haldeman 1841 [unclassified genus]
Acellinae, subfamily, Hannibal 1912 [Lymnaeidae]
Acentrogobius, Bleeker 1874 [Perciformes]
Acentrophorus, Traquair 1877 [Semionotidae]
Acentrophorus abbsi (Kirkby 1862) [Semionotidae]
Acentrophorus abbsii (Kirkby 1862) [Semionotidae]
Acentrophorus altus (J. W. Kirkby 1864) [Semionotidae]
Acentrophorus chicopensis, Newberry 1888 [unclassified species]
Acentrophorus glaphyrus (Agassiz 1833) [Semionotidae]
Acentrophorus glaphyurus (Agassiz 1833) [Semionotidae]
Acentrophorus varians (Kirkby 1862) [Semionotidae]
Acentrophryne, Regan 1926 [Linophrynidae]
Acentrophryne longidens, Regan 1926 [Linophrynidae]
Acentrotremites, R. Etheridge and P. H. Carpenter 1883 [Spiraculata]
Acentrotremites ellipticus, A. Breimer and D. B. Macurda 1972 [Spiraculata]
Acephialtitia, Li et al. 2015 [Ephialtitidae]
Acephialtitia colossa, Li et al. 2015 [Ephialtitidae]
Acer, C. Linnaeus 1753 [Aceraceae]
Acer aequidentatum, Lesquereux 1878 [Aceraceae]
Acer giganteum, Goeppert 1852 [unclassified species]
Acer vivarium, Knowlton 1899 [unclassified species]
Acera, Lamarck 1812 [unclassified genus]
Acera, subclass, Latreille 1802 [Insecta]
Acera browni (White 1887) [Acera]
Acera brownii, White 1887 [Acera]
Acera narica, Vredenburg 1925 [Anaspidea]
Aceraceae, family, A. L. de Jussieu [Sapindales]
Acerahedrina [Nassellaria]
Acerastea, Warren and Hutchinson 1987 [Derwentiidae]
Acerastea wadeae, Warren and Hutchinson 1987 [Derwentiidae]
Aceratheriinae, subfamily, Dollo 1885 [Rhinocerotidae]
Aceratheriini, tribe, Dollo 1885 [Rhinocerotidae]
Aceratherinae, subfamily (Dollo 1885) [Rhinocerotidae]
Aceratherini, tribe (Dollo 1885) [Rhinocerotidae]
Aceratherium, Kaup 1834 [Rhinocerotidae]
Aceratherium acutum, Marsh 1887 [Rhinocerotidae]
Aceratherium alfambrense, Cerdeño and Alcalá 1989 [Rhinocerotidae]
Aceratherium bavaricum, Stromer 1902 [Rhinocerotidae]
Aceratherium cadibonense, Roger 1898 [unclassified species]
Aceratherium copei, Osborn 1898 [Rhinocerotidae]
Aceratherium egregius, Cook 1908 [Rhinocerotidae]
Aceratherium exiguum, Lambe 1908 [Rhinocerotidae]
Aceratherium hesperium (Leidy 1865) [Rhinocerotidae]
Aceratherium incisivum (Cuvier 1824) [Rhinocerotidae]
Aceratherium incisivus (Cuvier 1824) [unclassified species]
Aceratherium kiliasi, Geraads and Koufos 1990 [Rhinocerotidae]
Aceratherium megalodum, Cope 1873 [Rhinocerotidae]
Aceratherium mite, Cope 1875 [Rhinocerotidae]
Aceratherium nebrascensis (Leidy 1850) [Hyracodontidae]
Aceratherium occidentale (Leidy 1850) [Rhinocerotidae]
Aceratherium oregonensis (Marsh 1873) [Rhinocerotidae]
Aceratherium persistens, H. F. Osborn 1904 [Rhinocerotidae]
Aceratherium platycephalum, Osborn and Wortman 1894 [Rhinocerotidae]
Aceratherium profectum, Matthew 1899 [Rhinocerotidae]
Aceratherium pumilum, Cope 1885 [Rhinocerotidae]
Aceratherium quadriplicatum (Cope 1873) [Rhinocerotidae]
Aceratherium simplicidens (Cope 1891) [Rhinocerotidae]
Aceratherium stigeri, Loomis 1908 [Rhinocerotidae]
Aceratherium tetradactylum (Lartet 1837) [Rhinocerotidae]
Aceratherium tridactylum, Osborn 1893 [Rhinocerotidae]
Aceratherium trigonodum, Osborn and Wortman 1894 [Rhinocerotidae]
Aceratherium truquianum, E. D. Cope 1879 [Rhinocerotidae]
Aceratherium zernowi, Borissiak 1914 [Rhinocerotidae]
Aceratiidae, family [Pediculati]
Acercaria, superorder, Börner 1904 [Insecta]
Acercaria (Börner 1904) [unclassified]
Acercostraca, order, Lehmann 1955 [Marrelomorpha]
Acericecis, Gagne 1983 [Cecidomyiidae]
Acericecis chaneyi (Cockerell 1927) [Cecidomyiidae]
Acerina, Güldenstadt [Percidae]
Acerina lepidopoma, Schtylko 1934 [Percidae]
Acerinium, Unger 1842 [unclassified genus]
Acerinium aegyptiacum, Schenk 1888 [unclassified species]
Acerinium danubiale, Unger 1842 [unclassified species]
Acerinucleus, Brown 1958 [Cellariidae]
Acerinucleus incudiferus (Maplestone 1902) [Cellariidae]
Aceriphyllum, Fontaine 1889 [unclassified genus]
Aceriphyllum aralioides, Fontaine 1889 [unclassified species]
Acerites, Viviani 1833 [unclassified genus]
Acerites ficifolia, Viviani 1833 [unclassified species]
Acernaspis, Campbell 1967 [Phacopidae]
Acernaspis (Eskaspis), Clarkson et al. 1977 [Phacopidae]
Acernaspis (Eskaspis) sufferta (Lamont 1947) [Phacopidae]
Acernaspis (Eskaspis) woodburnensis, Clarkson et al. 1977 [Phacopidae]
Acernaspis copperi, Chatterton and Ludvigsen 2004 [unclassified species]
Acernaspis orestes (Billings 1860) [unclassified species]
Acernaspis superciliexcelsis, Howells 1982 [unclassified species]
Acernaspis xynon, Howells 1982 [unclassified species]
Acerocanium [Nassellaria]
Acerocare [Ptychopariida]
Acerocare norvegicum, Moberg and Möller 1898 [Ptychopariida]
Acerocarina, Poulson 1951 [Ptychopariida]
Acerocarina glaber, Harrington 1938 [Ptychopariida]
Aceroproetus, Kolobova 1988 [Proetida]
Acerorhinus, Kretzoi 1942 [Rhinocerotidae]
Acerorhinus cornutus (Z.-X. Qiu and D.-F. Yan 1982) [Rhinocerotidae]
Acerorhinus neleus, Athanassiou et al. 2014 [unclassified species]
Acerorhinus zernowi (Borissiak 1914) [Rhinocerotidae]
Aceroryctes, Rankin and Holroyd 2014 [Palaeoryctidae]
Aceroryctes dulcis, Rankin and Holroyd 2014 [Palaeoryctidae]
Aceros, Hodgson 1844 [unclassified genus]
Aceros plicatus (Forster 1781) [unclassified species]
Acerosodontosauridae, family [Reptilia]
Acerosodontosaurus, Currie 1980 [Reptilia]
Acerosodontosaurus piveteaui, Currie 1980 [Reptilia]
Acerotella, Masner 1964 [Platygastridae]
Acerotella krylovi, Buhl 2002 [Platygastridae]
Acerotherium (Kaup 1834) [Rhinocerotidae]
Acerotherium albigense, Roman 1912 [Rhinocerotidae]
Acerotherium gaudryi, Rames 1886 [Eggysodontidae]
Aceroxylon, Hofmann 1944 [unclassified genus]
Acervoschwagerina (Hanzawa 1949) [Schwagerinidae]
Acervoschwagerina endoi (Hanzawa 1949) [Schwagerinidae]
Acervoschwagerina kagemoriensis (Huzimoto 1936) [Schwagerinidae]
Acervoschwagerina maclayi, Davydov 1996 [unclassified species]
Acervularia, Schweigger 1819 [Acervulariidae]
Acervularia bassleri, Webster and Fenton 1924 [unclassified species]
Acervularia davidsoni, Milne-Edwards and Haime 1851 [unclassified species]
Acervulariidae, family, Fromentel 1861 [Stauriida]
Acervulina [Acervulinidae]
Acervulinacea, superfamily, Schultze 1854 [Rotaliina]
Acervulinidae, family, Schultze 1854 [Acervulinacea]
Acesta, H. Adams and A. Adams 1858 [Limidae]
Acesta (Acesta), H. Adams and A. Adams 1858 [Limidae]
Acesta (Acesta) goajira (Olsson and Richards 1961) [Limidae]
Acesta (Acesta) hamlini (Dall 1900) [Limidae]
Acesta (Acesta) multiradiata (Gabb 1868) [Limidae]
Acesta (Acesta) rathbuni, Bartsch 1913 [unclassified species]
Acesta (Acesta) twinensis (Durham 1944) [unclassified species]
Acesta (Plicacesta) (Vokes 1963) [Limidae]
Acesta (Plicacesta) haseltinei (Dickerson 1914) [Limidae]
Acesta (Plicacesta) wilsoni, Moore 1984 [unclassified species]
Acesta bibbyi, Stilwell and Zinsmeister 1992 [Limidae]
Acesta brycei, Marwick 1953 [Limidae]
Acesta excavata (Fabricius 1780) [Limidae]
Acesta goajira, Olsson and Richards 1961 [Limidae]
Acesta maui, B. A. Marshall 2001 [Limidae]
Acesta webbi, Zinsmeister and Macellari 1988 [Limidae]
Acestrorhynchidae, family [Characiformes]
Acestrus, Agassiz 1845 [Blochiidae]
Acestrus elongatus, Casier 1966 [Blochiidae]
Acestrus ornatus, Woodward 1901 [Blochiidae]
Acetabularia, Lamouroux 1812 [Polyphysaceae]
Acetabulariaceae, family, Nägeli 1847 [Dasycladales]
Acetes, Milne-Edwards 1830 [Sergestidae]
Acetes sibogae, Hansen 1919 [Sergestidae]
Acetopeltis [Proetida]
Acevina [Mollusca]
Achaearanea, Strand 1929 [Theridiidae]
Achaearanea extincta, Wunderlich 1988 [Theridiidae]
Achaelousaurus horneri (Sampson 1994) [Ceratopsidae]
Achaenites, Braun 1851 [unclassified genus]
Achaenites ungeri, Braun 1851 [unclassified species]
Achaenodon (Cope 1873) [Artiodactyla]
Achaenodon fremdi, Lucas et al. 2004 [Artiodactyla]
Achaenodon insolens (Cope 1873) [Artiodactyla]
Achaenodon robustus, Osborn 1883 [Artiodactyla]
Achaenodon uintense (Osborn 1895) [Artiodactyla]
Achaenodon uintensis (Osborn 1895) [Artiodactyla]
Achaenodon vagus (Marsh 1876) [Achaenodontidae]
Achaenodontidae, family [Artiodactyla]
Achaenodontinae, subfamily () [unclassified subfamily]
Achaeopsis, Stimpson 1857 [unclassified genus]
Achaeopsis superciliaris, Ortmann 1893 [unclassified species]
Achaeoptilus, Scudder 1881 [Palaeodictyoptera]
Achaeoptilus ingens, Scudder 1881 [Palaeodictyoptera]
Achaetites, Handlirsch 1906 [Protogryllidae]
Achaetites sedgwicki (Brodie 1845) [Protogryllidae]
Achaeus, Leach 1817 [Inachidae]
Achaeus brevirostris, Haswell 1879 [Inachidae]
Achaeus curvirostris, Milne-Edwards 1873 [Inachidae]
Achaeus japonicus (de Hann 1850) [unclassified species]
Achaeus lacertosus, Stimpson 1858 [Inachidae]
Achaeus magnus, Muller 1978 [Inachidae]
Achaeus nomurai, Takeda and Fujiyama 1984 [Inachidae]
Achaeus parvulus, De Angeli and Caporiondo 2010 [Inachidae]
Achaeus podocheloides, Griffin 1970 [Inachidae]
Achaeus pugnax, de Man 1928 [Inachidae]
Achaeus tuberculatus, Miers 1879 [unclassified species]
Achalcinae, subfamily, Grootaert and Meuffels 1997 [Dolichopodidae]
Achalcus, Loew 1857 [Dolichopodidae]
Achalcus latipennis, Meunier 1907 [Dolichopodidae]
Achanarraspis, Anderson et al. 2000 [unclassified genus]
Achanarraspis reedi, Anderson et al. 2000 [unclassified species]
Achantopholidae, family (Nopcsa 1902) [unclassified family]
Acharacidae, family, Scarlato and Starobogatov 1979 [unclassified family]
Acharacinae, subfamily (Scarlato and Starobogatov 1979) [unclassified subfamily]
Acharax, Dall 1908 [Solemyidae]
Acharax belenensis, Olsson 1931 [Solemyidae]
Acharax clarificata, Dell 1995 [Solemyidae]
Acharax dalli (Clark 1925) [unclassified species]
Acharax doderleini (Mayer 1861) [unclassified species]
Acharax johnsoni (Dall 1891) [Solemyidae]
Acharax ventricosa (Conrad 1849) [unclassified species]
Achariaceae, family, H.A.T. Harms 1897 [Violales]
Achatella, Delo 1935 [Pterygometopidae]
Achatella (Achatella), Delo 1935 [Pterygometopidae]
Achatella (Achatella) bailyi, Salter 1864 [Pterygometopidae]
Achatella (Achatella) consobrina (Tripp 1954) [Pterygometopidae]
Achatella (Achatella) nieszkowskii (Schmidt 1881) [Pterygometopidae]
Achatella (Vironiaspis), Jaanusson and Ramsköld 1993 [Pterygometopidae]
Achatella (Vironiaspis) kegelensis (Schmidt 1881) [Pterygometopidae]
Achatella (Vironiaspis) kuckersiana (Schmidt 1881) [unclassified species]
Achatella (Vironiaspis) kuckersianus (Schmidt 1881) [Pterygometopidae]
Achatella achates (Billings 1860) [Pterygometopidae]
Achatella consobrina, Tripp 1954 [Pterygometopidae]
Achatella katharina (Bradley 1930) [Pterygometopidae]
Achatella kuckersianus (Schmidt 1881) [unclassified species]
Achatella schmidti, Warburg 1925 [Pterygometopidae]
Achatina, Lamarck 1799 [Achatinidae]
Achatina (Limicolaria) (Schumacher 1817) [unclassified subgenus]
Achatina (Limicolaria) martensiana, Smith 1880 [unclassified species]
Achatina loxostoma, Klein 1853 [Cochlicopidae]
Achatina pellucida, Deshayes 1824 [Stiliferidae]
Achatina pellucidus, Deshayes 1824 [Stiliferidae]
Achatina sculpturata, Neubert and van Damme 2012 [Achatinidae]
Achatina stuhlmanni, von Martens 1892 [unclassified species]
Achatinellidae, family, Gulick 1873 [Gastropoda]
Achatinelloidea, superfamily, Gulick 1873 [Gastropoda]
Achatinidae, family, Swainson 1840 [Gastropoda]
Achatinoidea, superfamily, Swainson 1840 [Gastropoda]
Achatocarpaceae, family, A. Heimerl 1934 [Caryophyllales]
Acheilognathidae, family [Cypriniformes]
Acheilops, Ulrich 1931 [Catillicephalidae]
Acheilus, Clark 1924 [Catillicephalidae]
Acheilus microps, Rasetti 1944 [Catillicephalidae]
Acheilus monile, Fortey 1983 [Catillicephalidae]
Acheilus oryx, Fortey 1983 [Catillicephalidae]
Achelata, infraorder, G. Scholtz and S. Richter 1995 [Decapoda]
Acheloma, Cope 1882 [Trematopidae]
Acheloma casei, Broili 1913 [Saurerpetontidae]
Acheloma cumminsi, Cope 1882 [Trematopidae]
Acheloma dunni, Polley and Reisz 2011 [Trematopidae]
Acheloma pricei, Olson 1941 [Trematopidae]
Acheloma whitei, Olson 1941 [Trematopidae]
Achelomidae, family, Watson 1919 [Rhachitomi]
Achelonia, von Meyer 1860 [unclassified genus]
Achelonia formosa, von Meyer 1860 [unclassified species]
Achelous, De Haan 1833 [Portunidae]
Achelous depressifrons (Stimpson 1862) [unclassified species]
Achelous gibbesii (Stimpson 1862) [unclassified species]
Achelous obtusus, A. Milne Edwards 1860 [unclassified species]
Achelous sebae (H. Milne-Edwards 1834) [Portunidae]
Achelous spinimanus (Latreille 1819) [unclassified species]
Achelous xantusii, Stimpson 1860 [unclassified species]
Achelousaurus, Sampson 1994 [Ceratopsidae]
Achelousaurus horneri, Sampson 1994 [Ceratopsidae]
Achenium, Curtis 1829 [Staphylinidae]
Achenium ingens, Oustalet 1874 [Staphylinidae]
Acheonus, Dolin 1980 [Elateridae]
Acheonus abbreviatus, Dolin 1980 [Elateridae]
Acheonus gracilis, Dolin 1980 [Elateridae]
Acheonus minutissimus, Dolin 1980 [Elateridae]
Acheronictis, Hayes 2000 [Mustelidae]
Acheronictis webbi, Hayes 2000 [Mustelidae]
Acheronodon, Archibald 1982 [Microcosmodontidae]
Acheronodon garbani, Archibald 1982 [Microcosmodontidae]
Acherontemys, Hay 1899 [Chelydridae]
Acherontemys heckmani, Hay 1899 [Chelydridae]
Acherontiscidae, family, Carroll 1967 [Lepospondyli]
Acherontiscus, Carroll 1969 [Acherontiscidae]
Acherontiscus caledoniae, Carroll 1969 [Acherontiscidae]
Acherontisuchus, Hastings et al. 2011 [Dyrosauridae]
Acherontisuchus guajiraensis, Hastings et al. 2011 [Dyrosauridae]
Acheroraptor, Evans et al. 2014 [Dromaeosauridae]
Acheroraptor temertyorum, Evans et al. 2014 [Dromaeosauridae]
Acheta, Fabricius 1775 [Gryllidae]
Acheta domestica (Linnaeus 1758) [Gryllidae]
Acheta marioni, Theobald 1937 [Gryllidae]
Acheta quaerula, Weyenbergh 1869 [Elcanidae]
Acheta sedgwicki, Brodie 1845 [Protogryllidae]
Achetomorpha, Gorochov 2019 [unclassified genus]
Achetomorpha irregularis, Gorochov 2019 [unclassified species]
Achetomorpha schindewolfi (Zeuner 1937) [unclassified species]
Achguigites, Klug 2002 [Agoniatitidae]
Achguigites tafilaltensis, Klug 2002 [Agoniatitidae]
Achilemys, Hay 1908 [Testudinidae]
Achilemys allabiata (Cope 1871) [unclassified species]
Achilemys cassouleti, Claude and Tong 2004 [Testudinidae]
Achilidae, family [Hemiptera]
Achilinae, subfamily, Stal 1866 [Achilidae]
Achilini, tribe, Stal 1866 [Achilidae]
Achilleia (Renz 1913) [Hildoceratidae]
Achilleodinium, Eaton 1976 [Gonyaulacaceae]
Achilleodinium bianii, Hultberg 1985 [Gonyaulacaceae]
Achillesaurus, Martinelli and Vera 2007 [Alvarezsauridae]
Achillesaurus manazonnei (Martinelli and Vera 2007) [Alvarezsauridae]
Achillesaurus manazzonei, Martinelli and Vera 2007 [Alvarezsauridae]
Achilleum, Oken 1815 [unclassified genus]
Achilleum auriforme, Roemer 1840 [Seliscothonidae]
Achilleum costatum, Münster 1829 [Stellispongiidae]
Achilleum faundelii, Münster 1841 [Amorphofungia]
Achilleum grande, Winckler 1861 [unclassified species]
Achilleum granulosum, Münster 1841 [Amorphofungia]
Achilleum milleporatum, Münster 1841 [Ceratoporellidae]
Achilleum obscurum, Münster 1841 [Amorphofungia]
Achilleum patellare, Münster 1841 [Cupulochonia]
Achilleum polymorphum, Klipstein 1843 [Pharetrospongiidae]
Achilleum poraceum, Klipstein 1843 [Leiofungia]
Achilleum radiciforme, Münster 1841 [Leiofungia]
Achilleum reticulare, Münster 1841 [Leiofungia]
Achilleum rugosum, Münster 1841 [Leiofungia]
Achilleum subcariosum, Münster 1841 [Amorphofungia]
Achilleum verrucosum, Münster 1841 [Pharetrospongiidae]
Achilleum voluta, Wissmann 1841 [Amorphofungia]
Achilleum waltheri, Münster 1841 [Amorphofungia]
Achillini, tribe, Emeljanov 1991 [Achilidae]
Achillobator, Perle et al. 1999 [Dromaeosauridae]
Achillobator giganticus, Perle et al. 1999 [Dromaeosauridae]
Achiridae, family [Pleuronectiformes]
Achiropsettidae, family [Pleuronectiformes]
Achistridae, family, Frizzell and Exline 1955 [Apodida]
Achistrulidae, family, Deflandre-Rigaud 1962 [Holothuroidea]
Achistrulum, Deflandre-Rigaud 1962 [Achistrulidae]
Achistrulum issleri (Croneis and McCormack 1932) [Achistridae]
Achistrulum monochordatum (Hodson et al. 1956) [Achistridae]
Achistrulum nicholsoni (Etheridge 1881) [Achistridae]
Achistrum, Etheridge 1881 [Achistridae]
Achistrum (Achistrum), Hampton 1958 [Achistridae]
Achistrum (Achistrum) brownwoodensis (Croneis and McCormack 1932) [Achistridae]
Achistrum (Achistrum) issleri (Croneis and McCormack 1932) [Achistridae]
Achistrum (Achistrum) ludwigi (Croneis and McCormack 1932) [Achistridae]
Achistrum (Achistrum) nicholsoni (Etheridge 1881) [Achistridae]
Achistrum (Achistrum) triassicum (Frizzell and Exline 1955) [Achistridae]
Achistrum (Aduncrum), Hampton 1958 [Achistridae]
Achistrum (Aduncrum) cordatum (Hampton 1957) [Achistridae]
Achistrum (Cancellrum), Hampton 1958 [Achistridae]
Achistrum (Cancellrum) bichordata, Fletcher 1962 [Achistridae]
Achistrum (Cancellrum) bicordata, Fletcher 1962 [Achistridae]
Achistrum (Cancellrum) britanica, Soodan and Whatley 1987 [Achistridae]
Achistrum (Cancellrum) gamma (Hodson et al. 1956) [Achistridae]
Achistrum (Cancellrum) meltonensis, Soodan and Whatley 1987 [Achistridae]
Achistrum (Cancellrum) monochordata (Hodson et al. 1956) [Achistridae]
Achistrum (Cancellrum) pilgrimi, Fletcher 1962 [Achistridae]
Achistrum (Cancellrum) trichordata, Fletcher 1962 [Achistridae]
Achistrum (Cancellrum) warboysensis, Soodan and Whatley 1987 [Achistridae]
Achistrum (Porachistrum), Beckmann 1965 [Apodida]
Achistrum (Porachistrum) multiperforatum, Beckmann 1965 [Achistridae]
Achistrum (Spinrum), Hampton 1958 [Achistridae]
Achistrum (Spinrum) bartensteini (Frizzell and Exline 1955) [Achistridae]
Achistrum bartensteini, Frizzell and Exline 1955 [Achistridae]
Achistrum beckmanni, Kozur and Mostler 1971 [Achistridae]
Achistrum bichordata (Fletcher 1962) [Achistridae]
Achistrum brevis, Gutschick 1959 [Achistridae]
Achistrum brevis, Mostler 1971 [Achistridae]
Achistrum brownwoodensis (Croneis and McCormack 1932) [Achistridae]
Achistrum coloculum, Gutschick et al. 1967 [Achistridae]
Achistrum cordatum, Hampton 1957 [Achistridae]
Achistrum frizzelli, Langenheim and Epis 1957 [Achistridae]
Achistrum gamma, Hodson et al. 1956 [Achistridae]
Achistrum huckei (Frizzell and Exline 1955) [Achistridae]
Achistrum issleri (Croneis and McCormack 1932) [Achistridae]
Achistrum longirostrum, Mostler 1971 [Achistridae]
Achistrum ludwigi (Croneis and McCormack 1932) [Achistridae]
Achistrum monochordata, Hodson et al. 1956 [Achistridae]
Achistrum multiperforatum (Beckmann 1965) [Achistridae]
Achistrum nicholsoni, Etheridge 1881 [Achistridae]
Achistrum permianum (Spandel 1898) [Achistridae]
Achistrum pulchrum, Kozur 1969 [Achistridae]
Achistrum triassicum, Frizzell and Exline 1955 [Achistridae]
Achistrum tuto, Boczarowski 2001 [Achistridae]
Achistrum varicum, Boczarowski 2001 [Achistridae]
Achitectonica, Bolten 1798 [unclassified genus]
Achitherium (von Meyer 1844) [unclassified genus]
Achitherium minimus (Douglass 1899) [unclassified species]
Achiurus [Pleuronectiformes]
Achlamydocarpon, Schumacker-Lambry 1966 [unclassified genus]
Achlamydocarpon belgicum, Schumacker-Lambry 1966 [unclassified species]
Achlyites, Meschinelli 1898 [unclassified genus]
Achlyites penetrans, Duncan 1898 [unclassified species]
Achlyoconis, Engel 2016 [Coniopterygidae]
Achlyoconis heptatrichia, Engel 2016 [Coniopterygidae]
Achlyoconis jiae, Li et al. 2019 [unclassified species]
Achlyoscapter, Hutchison 1968 [Talpidae]
Achlyoscapter longirostris, Hutchison 1968 [Talpidae]
Achlysictis, F. Ameghino 1891 [Thylacosmilidae]
Achlysictis lelongi, Ameghino 1891 [Thylacosmilidae]
Achlysictis propampina (F. Ameghino 1891) [Borhyaenidae]
Achlysopsis, Fritz 1968 [Ptychopariidae]
Achlysopsis hemitora, Fritz 1968 [Ptychopariidae]
Achlysopsis liokata, Fritz 1968 [Ptychopariidae]
Achnanthaceae, family [Bacillariophyceae]
Achnanthes [Bacillariophyceae]
Achoania, Zhu et al. 2001 [Sarcopterygii]
Achoania jarvikii, Zhu et al. 2001 [Achoania]
Achoerodus, Gill 1863 [unclassified genus]
Achomosphaera, Evitt 1963 [Gonyaulacaceae]
Achomosphaera ramulifera (Deflandre 1937) [Gonyaulacaceae]
Achomosphaera sagena, Davey and Williams 1966 [Gonyaulacaceae]
Achomosphaera triangulata, Davey and Williams 1969 [Gonyaulacaceae]
Achomosphaera verdieri, Below 1982 [Gonyaulacaceae]
Achorocyathus [Cribricyathea]
Achorutes, Templeton 1835 [unclassified genus]
Achorutes bengtssoni, Agren 1904 [Hypogastruridae]
Achorutes latidens, von Olfers 1907 [Collembola]
Achorutes ununguiculata, Tullberg 1869 [Hypogastruridae]
Achradocrinus, Schultze 1866 [Cladida]
Achradocystites, Volborth 1870 [Comarocystitida]
Achradosporis, Srivastava 1975 [Pteridopsida]
Achradosporis lurensis, Ruiz and Quattrocchio 1997 [Pteridopsida]
Achrestocoris, Scudder 1890 [Coreidae]
Achrestocoris cinerarius, Scudder 1890 [Coreidae]
Achrestogrammus, Jordan 1921 [Hexagrammidae]
Achrestogrammus achrestus (Jordan and Gilbert 1919) [Hexagrammidae]
Achrochordidae, family (Bonaparte 1840) [unclassified family]
Achrochordiella, Rigby 1981 [Demospongea]
Achrochordiella vokesi, Rigby 1981 [Demospongea]
Achrochordonia [Demospongea]
Achrysocharoides, Girault 1913 [Eulophidae]
Achrysonini, tribe, Lacordaire 1868 [Cerambycidae]
Achrysopilus, Zhang et al. 2008 [Rhagionidae]
Achrysopilus neimenguensis, Zhang et al. 2008 [Rhagionidae]
Achtiaria, Borissiak 1914 [Giraffidae]
Achunoproductus, Ustritsky 1971 [Schrenkiellidae]
Achyrodon, Owen 1871 [Dryolestidae]
Achyrodon nanus, Owen 1871 [Dryolestidae]
Achyrodon pusillus, Owen 1871 [Dryolestidae]
Acichelyidae, family, Lydekker 1889 [Testudines]
Acichelys, Meyer 1854 [Acichelyidae]
Acichelys approximata, Wagner 1856 [Euryaspis]
Acichelys redenbacheri (Meyer 1839) [Acichelyidae]
Acicnemides, tribe, Lacordaire 1865 [Curculionidae]
Acicnemidini, tribe (Lacordaire 1865) [Curculionidae]
Acicnemis, Fairmaire 1849 [Curculionidae]
Acicnemis fossilis, Kleine 1924 [Curculionidae]
Aciconularia, He 1987 [unclassified genus]
Aciconularia absidata (Jiang 1982) [Carinachitidae]
Acicula, Hartmann 1821 [Aciculidae]
Acicula giuntellii, Harzhauser et al. 2015 [Aciculidae]
Acicula lineata (Draparnaud 1801) [Aciculidae]
Acicula lineatus, Draparnaud 1801 [unclassified species]
Aciculadae, family, Gray 1850 [Architaenioglossa]
Acicularia, d'Archiac 1843 [Dasycladales]
Acicularia paventina, d'Archiac 1843 [unclassified species]
Aciculata, subclass, Rouse and Fauchald 1997 [Polychaeta]
Aciculella [Hippocrepinidae]
Aciculella, Pia 1927 [Dasycladaceae]
Aciculella bacillum, Pia 1927 [unclassified species]
Aciculidae, family (Gray 1850) [Architaenioglossa]
Aciculina, Deshayes 1861 [unclassified genus]
Aciculina emarginata, Deshayes 1861 [Ebalidae]
Aciculina scalarina, Deshayes 1861 [Ebalidae]
Aciculiscala, N. F. Sohl 1963 [Epitoniidae]
Aciculiscala acuta, N. F. Sohl 1963 [Epitoniidae]
Aciculiscala coffea, D. T. Dockery 1993 [Epitoniidae]
Aciculiscala jacobi (Palmer 1937) [Epitoniidae]
Aciculolenus, Palmer 1965 [Ptychopariida]
Aciculolenus peculiaris, Palmer 1965 [Ptychopariida]
Aciculopoda, R. M. Feldmann and C. E. Schweitzer 2010 [Decapoda]
Aciculopoda mapesi, R. M. Feldmann and C. E. Schweitzer 2010 [Decapoda]
Acidaspidae, family, Barrande 1846 [unclassified family]
Acidaspidella, Pokrovskaya 1963 [Lichakephalidae]
Acidaspidella limata, Rozova 1963 [Lichakephalidae]
Acidaspides, Lermontova 1951 [Lichakephalidae]
Acidaspides borealis, Tchernysheva 1960 [unclassified species]
Acidaspides lermontovae, Tchernysheva 1953 [unclassified species]
Acidaspides precurrens, Lermontova 1951 [unclassified species]
Acidaspidina, Lazerenko 1960 [Lichakephalidae]
Acidaspidina plana, Lazarenko 1960 [Lichakephalidae]
Acidaspidinae, subfamily, Salter 1864 [Lichida]
Acidaspis, Murchison 1839 [Lichida]
Acidaspis (Glaphurus), Raymond 1905 [Lichida]
Acidaspis (Glaphurus) pustulatus (Walcott 1877) [Glaphuridae]
Acidaspis aviensis, Bruton 1968 [Lichida]
Acidaspis bispinosa, McCoy 1846 [Lichida]
Acidaspis bispinosus, McCoy 1846 [Lichida]
Acidaspis brightii, Murchison 1839 [Lichida]
Acidaspis callipareos, Thomson 1857 [unclassified species]
Acidaspis cardiolarum, Hede 1915 [unclassified species]
Acidaspis clevei, Warburg 1925 [Lichida]
Acidaspis dalecarlica, Törnquist 1884 [Lichida]
Acidaspis danai, Hall 1862 [Lichida]
Acidaspis dealgach, Lamont 1948 [unclassified species]
Acidaspis emarginata, Schmidt 1885 [unclassified species]
Acidaspis evoluta, Törnquist 1884 [Lichida]
Acidaspis furcata, Linnarsson 1869 [unclassified species]
Acidaspis grayae, Etheridge 1878 [unclassified species]
Acidaspis ida, Winchell and Marcy 1865 [Lichida]
Acidaspis kuckersiana, Schmidt 1885 [Lichida]
Acidaspis lalage, Wyville Thomson 1857 [unclassified species]
Acidaspis laticapitata, Warburg 1925 [Lichida]
Acidaspis lothiana, Lamont 1948 [unclassified species]
Acidaspis marklini, Angelin 1854 [unclassified species]
Acidaspis olini, Troedsson 1918 [unclassified species]
Acidaspis pectinata, Angelin 1854 [unclassified species]
Acidaspis solis, Oepik 1925 [Lichida]
Acidaspis spiniger, Hall 1847 [Bathyuridae]
Acidaspis unica, Thomson 1857 [Phacopida]
Acidaspis viruana, Oepik 1937 [Lichida]
Acides, tribe, Billberg 1820 [Tenebrionidae]
Acidiella, Hendel 1914 [Tephritidae]
Acidiphorus, Raymond 1925 [Bathyuridae]
Acidiphorus brevispicatus, Fortey 1980 [Bathyuridae]
Acidiphorus brevus (Hintze 1952) [Bathyuridae]
Acidiphorus brighti (Hintze 1952) [Bathyuridae]
Acidiphorus hesperia (Ross and Barnes 1967) [Bathyuridae]
Acidiphorus kindlei (Whittington 1963) [Bathyuridae]
Acidiphorus ligo, Fortey 1980 [Bathyuridae]
Acidiphorus lineotuberculatus, Fortey and Droser 1999 [Bathyuridae]
Acidiphorus moorei (Raymond 1913) [Bathyuridae]
Acidiphorus pseudobathyurus, Ross and Barnes 1967 [Bathyuridae]
Acidiphorus rostratus (Whittington 1963) [Bathyuridae]
Acidiphorus spinifer, Raymond 1925 [Bathyuridae]
Acidiphorus wahwahensis (Hintze 1952) [Bathyuridae]
Acidiphorus whittingtoni, Brett and Westrop 1996 [Bathyuridae]
Acidiphorus williamsi (Ross 1951) [Bathyuridae]
Acidiscus, Rasetti 1966 [Weymouthiidae]
Acidnomelos [Nassellaria]
Acidobacteria [Negibacteria]
Acidobacteria, phylum () [Negibacteria]
Acidocerina, subtribe, Zaitzev 1908 [Hydrophilidae]
Acidocerinae, subfamily (Zaitzev 1908) [Hydrophilidae]
Acidocharacus [Sabelliditida]
Acidolites, Lang et al. 1940 [Coccoserididae]
Acidomomys, Bloch et al. 2002 [Paromomyidae]
Acidomomys hebeticus, Bloch et al. 2002 [Paromomyidae]
Acidopsidae, family, Stevcic 2005 [Decapoda]
Acidorhynchus, Stensio 1925 [Saurichthyidae]
Acidorhynchus acutus (Agassiz 1844) [Saurichthyidae]
Acidorhynchus brevirostris (Woodward 1895) [Saurichthyidae]
Acidota, Leconte [Staphylinidae]
Acidota crenata (Fabricius 1792) [Staphylinidae]
Acidota quadrata (Zetterstedt 1838) [Staphylinidae]
Acidota tenue, LeConte 1863 [Staphylinidae]
Acidotocarena [Problematica]
Acidusus (Opik 1979) [Ptychagnostidae]
Acidusus atavus (Tullberg 1880) [Ptychagnostidae]
Acila, H. Adams and A. Adams 1858 [Nuculidae]
Acila (Acila), Adams and Adams 1858 [Nuculidae]
Acila (Acila) brevis (Nagao and Huzioka 1941) [Nuculidae]
Acila (Acila) divaricata (Hinds 1843) [Nuculidae]
Acila (Acila) gettysburgensis (Regan 1909) [unclassified species]
Acila (Acila) isthmica (Brown and Pilsbry 1911) [Nuculidae]
Acila (Acila) isthmica burica (Olsson 1942) [Nuculidae]
Acila (Acila) kholmskensis, Krishtofovich 1964 [Nuculidae]
Acila (Acila) mirabilis (Adams and Reeve 1850) [Nuculidae]
Acila (Acila) praedivaricata, Nagao and Huzioka 1941 [Nuculidae]
Acila (Acila) semirostrata (Grant, IV and Gale 1931) [unclassified species]
Acila (Acila) shimoyamai, Oyama and Mizuno 1958 [Nuculidae]
Acila (Acila) submirabilis (Makiyama 1926) [Nuculidae]
Acila (Acila) vigilia (H. G. Schenck 1936) [Nuculidae]
Acila (Truncacila), Grant and Gale 1931 [Nuculidae]
Acila (Truncacila) allisoni, Squires and Saul 2006 [Nuculidae]
Acila (Truncacila) bellula, Slodkewitsch 1967 [Nuculidae]
Acila (Truncacila) beringiana, Slodkevisch 1967 [Nuculidae]
Acila (Truncacila) bivirgata (Sowerby 1836) [Nuculidae]
Acila (Truncacila) blancoensis (Howe 1922) [unclassified species]
Acila (Truncacila) castrensis (Hinds 1843) [Nuculidae]
Acila (Truncacila) cobboldae (Linnaeus 1767) [Nuculidae]
Acila (Truncacila) conradi (Meek 1864) [unclassified species]
Acila (Truncacila) dalli (Arnold 1908) [unclassified species]
Acila (Truncacila) decisa (Conrad 1855) [unclassified species]
Acila (Truncacila) demessa (Finlay 1927) [Nuculidae]
Acila (Truncacila) demessa haidana, Packard 1936 [Nuculidae]
Acila (Truncacila) galinae, Slodkewitsch 1967 [Nuculidae]
Acila (Truncacila) grahami, Squires and Saul 2006 [Nuculidae]
Acila (Truncacila) haidana (Packard 1936) [Nuculidae]
Acila (Truncacila) hokkaidoensis (Nagao 1932) [Nuculidae]
Acila (Truncacila) jucunda (Thiele and Jaeckel 1931) [Nuculidae]
Acila (Truncacila) moneronica, Slodkewitsch 1967 [Nuculidae]
Acila (Truncacila) muta (Clark 1918) [Nuculidae]
Acila (Truncacila) nagaoi, Oyama and Mizuno 1958 [Nuculidae]
Acila (Truncacila) nehalemensis (Hanna 1924) [unclassified species]
Acila (Truncacila) nelsoni (Clark 1925) [unclassified species]
Acila (Truncacila) osugii, Nagao and Huzioka 1941 [Nuculidae]
Acila (Truncacila) princeps, Schenck 1943 [Nuculidae]
Acila (Truncacila) pugetensis (Clark 1925) [unclassified species]
Acila (Truncacila) rosaria, Squires and Saul 2006 [Nuculidae]
Acila (Truncacila) schencki, Stoyanow 1949 [Nuculidae]
Acila (Truncacila) shumardi (Dall 1909) [Nuculidae]
Acila bivirgata (Sowerby 1836) [Nuculidae]
Acila brevis, Nagao and Huzioka 1941 [Nuculidae]
Acila castrensis (Hinds 1843) [Nuculidae]
Acila conradi (Meek 1864) [unclassified species]
Acila demessa, Finlay 1927 [Nuculidae]
Acila divaricata (Hinds 1843) [Nuculidae]
Acila empirensis, Howe 1922 [Nuculidae]
Acila gabbiana, Dickerson 1916 [unclassified species]
Acila isthmica (Brown and Pilsbry 1911) [Nuculidae]
Acila isthmica burica, Olsson 1942 [Nuculidae]
Acila lajollaensis, Hanna 1927 [unclassified species]
Acila mirabilis, Adams and Reeve 1850 [Nuculidae]
Acila muta, Clark 1918 [Nuculidae]
Acila nagaoi (Oyama and Mizuno 1958) [Nuculidae]
Acila nehalemensis, Hanna 1924 [unclassified species]
Acila paita, Olsson 1931 [Nuculidae]
Acila plura, Olsson 1931 [Nuculidae]
Acila shumardi (Dall 1909) [Nuculidae]
Acila submirabilis, Makiyama 1926 [Nuculidae]
Acila vigilia, H. G. Schenck 1936 [Nuculidae]
Acilana, Khomenko 1937 [Nuculanidae]
Acilia, Koken 1896 [Prostyliferidae]
Acilia basistriata, Nützel et al. 2012 [Prostyliferidae]
Acilia gabbiana, Dickerson 1916 [unclassified species]
Acilia imperatii (Stoppani 1858) [Prostyliferidae]
Acilia insecta, Kittl 1912 [unclassified species]
Aciliini, tribe, Thomson 1867 [Dytiscidae]
Acilius, Leach 1817 [Dytiscidae]
Acilius florissantensis, Wickham 1909 [Dytiscidae]
Acilius praesulatus, Lomnicki 1894 [Dytiscidae]
Acimetopus, Rasetti 1966 [Weymouthiidae]
Acinacodus, Lopatin et al. 2010 [Amphidontidae]
Acinacodus tagaricus, Lopatin et al. 2010 [Amphidontidae]
Acinetaster, Kesling 1982 [Stenuroidea]
Acinetaster konieckii, Kesling 1982 [Stenuroidea]
Acinetasteridae, family, Kesling 1982 [Stenuroidea]
Acinocricus, Conway-Morris and Robinson 1988 [Luolishaniidae]
Acinocricus stichus, Conway-Morris and Robison 1988 [Luolishaniidae]
Acinonyx, Brookes 1828 [Felidae]
Acinonyx (Miracinonyx), Adams 1979 [Felidae]
Acinonyx (Miracinonyx) studeri (Savage 1960) [unclassified species]
Acinonyx (Miracinonyx) trumani (Orr 1969) [unclassified species]
Acinonyx aicha, Geraads 1997 [Felidae]
Acinonyx jubatus (Schreber 1775) [Felidae]
Acinonyx pardinensis, Croizet and Jobert 1828 [unclassified species]
Acinonyx studeri (Savage 1960) [Felidae]
Acinonyx trumani (Orr 1969) [Felidae]
Acinophyllum, McLaren 1959 [Eridophyllidae]
Acinulus, Seguenza 1903 [Rissoidae]
Acipenser, Linnaeus 1758 [Acipenseridae]
Acipenser albertensis, Lambe 1902 [Acipenseridae]
Acipenser brevirostrum, Leseuer 1818 [Acipenseridae]
Acipenser eruciferus (Cope 1876) [Acipenseridae]
Acipenser fulvescens, Rafinesque 1817 [Acipenseridae]
Acipenser gigantissimus, Nessov 1997 [Acipenseridae]
Acipenser molassicus, Probst 1882 [Acipenseridae]
Acipenser ornatus, Leidy 1873 [Acipenseridae]
Acipenser oxyrhynchus, Mitchell 1814 [Acipenseridae]
Acipenser toliapicus, Agassiz 1844 [Acipenseridae]
Acipenser tuberculosus, Probst 1882 [Acipenseridae]
Acipenseridae, family, Bonaparte 1831 [Acipenseriformes]
Acipenseriformes, order, Berg 1940 [Actinopteri]
Acipenserinae, subfamily, Bonaparte 1838 [Acipenseridae]
Acipenserini, tribe [Acipenseridae]
Acipenseriodei, suborder, Nelson 2016 [unclassified suborder]
Acipenseristomi, Grande and Bemis 1996 [Acipenseriformes]
Acipenseroidei, suborder [Acipenseriformes]
Aciphylla, Hector 1886 [unclassified genus]
Aciphylla pungens, Hector 1886 [unclassified species]
Aciprion, Cope 1873 [Iguanidae]
Aciprion formosum, Cope 1873 [Iguanidae]
Aciprion majus, Gilmore 1928 [Iguanidae]
Acirsa, Mörch 1857 [Epitoniidae]
Acirsa (Acirsa), Mörch 1857 [Epitoniidae]
Acirsa (Acirsa) vaquerosensis, Durham 1937 [unclassified species]
Acirsa (Acirsella) (de Boury 1886) [Epitoniidae]
Acirsa (Acirsella) henryleai, Price and Palmer 1928 [unclassified species]
Acirsa (Hemiacirsa) (de Boury 1890) [Epitoniidae]
Acirsa (Hemiacirsa) americana (B. Wade 1926) [Epitoniidae]
Acirsa (Hemiacirsa) clathrata, N. F. Sohl 1964 [unclassified species]
Acirsa (Hemiacirsa) cretacea, B. Wade 1917 [unclassified species]
Acirsa (Hemiacirsa) flexicostata, N. F. Sohl 1964 [unclassified species]
Acirsa (Hemiacirsa) gracilior (Meyer 1886) [Epitoniidae]
Acirsa (Hemiacirsa) whitneyi, Palmer 1937 [Epitoniidae]
Acirsa (Plesioacirsa) (de Boury 1909) [Epitoniidae]
Acirsa (Plesioacirsa) culmosa, N. F. Sohl 1964 [Epitoniidae]
Acirsa (Plesioacirsa) gravida, N. F. Sohl 1964 [Epitoniidae]
Acirsa (Plesioacirsa) implexa, N. F. Sohl 1964 [Epitoniidae]
Acirsa (Plesioacirsa) microstriata, B. Wade 1917 [Epitoniidae]
Acirsa (Plesioacirsa) wadei, Cossmann 1925 [unclassified species]
Acirsa (Proscala) (Cossmann 1912) [unclassified subgenus]
Acirsa (Proscala) albensis (d'Orbigny 1902) [unclassified species]
Acirsa culmosa (N. F. Sohl 1964) [Epitoniidae]
Acirsa delta, Squires and Saul 2003 [unclassified species]
Acirsa gravida (N. F. Sohl 1964) [Epitoniidae]
Acirsa penepolaris (S. Wood 1872) [Epitoniidae]
Acirsella, de Boury 1886 [Epitoniidae]
Acirsella effiae (Willett 1939) [unclassified species]
Acirsinae, subfamily [Epitoniidae]
Acisarcuatus, Liu et al. 2014 [Necrotauliidae]
Acisarcuatus locellatus, Zhang et al. 2017 [Necrotauliidae]
Acisarcuatus variradius, Liu et al. 2014 [Necrotauliidae]
Acitheca, Schimper 1879 [unclassified genus]
Acitheca polymorpha, Brongniart 1879 [unclassified species]
Acixiites, Hamilton 1990 [Achilidae]
Acixiites costalis, Hamilton 1990 [Achilidae]
Acixiites immodesta, Hamilton 1990 [Achilidae]
Aclada, Loew 1850 [Diadocidiidae]
Aclada parallela (Evenhuis 1994) [Diadocidiidae]
Acleistoceras, Hyatt 1884 [Acleistoceratidae]
Acleistoceratidae, family, Flower 1950 [Oncocerida]
Acleistochelys, Gaffney et al. 2007 [Bothremydidae]
Acleistochelys maliensis, Gaffney et al. 2007 [Bothremydidae]
Acleistorhinidae, family, Daly 1969 [Reptilia]
Acleistorhinus, Daly 1969 [Acleistorhinidae]
Acleistorhinus pteroticus, Daly 1969 [Acleistorhinidae]
Aclemus, Zhang et al. 2016 [Eolepidopterigidae]
Aclemus patulus, Zhang et al. 2016 [Eolepidopterigidae]
Aclerogamasus, Athias 1971 [Parasitidae]
Aclerogamasus stenocornis, Witaliński 2000 [Parasitidae]
Acletoxenina, subtribe, Grimaldi 1990 [Drosophilidae]
Acliceratia, Ponder 1984 [Iravadiidae]
Aclididae, family, G. O. Sars 1878 [Gastropoda]
Aclis, Loven 1846 [Aclididae]
Aclis ascaris (Turton 1819) [Aclididae]
Aclis minuta, Stevens 1858 [Murchisoniidae]
Aclis modesta, Meyer 1886 [Aclididae]
Aclis robusta, Stevens 1858 [Donaldinidae]
Aclis stevensoni, White 1881 [Donaldinidae]
Aclisina, de Koninck 1881 [Murchisoniidae]
Aclisina (Rhabdospira) (Donald 1898) [Murchisoniidae]
Aclisina (Rhabdospira) compacta, Donald 1898 [Murchisoniidae]
Aclisina (Rhabdospira) selkirkii, Donald 1898 [Murchisoniidae]
Aclisina acutula (Dawson 1868) [Murchisoniidae]
Aclisina attenuata, Donald 1898 [Donaldinidae]
Aclisina barnetti, Kindle 1900 [Donaldinidae]
Aclisina barnetti elongata, Kindle 1900 [Donaldinidae]
Aclisina bellilineata, Miller 1891 [Donaldinidae]
Aclisina beneventa, Dietz 1911 [Murchisoniidae]
Aclisina bisulcata, Chronic 1952 [Murchisoniidae]
Aclisina breva, Sayre 1930 [Murchisoniidae]
Aclisina cancellata, Mark 1912 [Pseudozygopleuridae]
Aclisina conditi, Mark 1912 [Donaldinidae]
Aclisina costata, Mark 1912 [Pseudozygopleuridae]
Aclisina costatula, Donald 1885 [Donaldinidae]
Aclisina elegantula, Donald 1898 [Donaldinidae]
Aclisina faber, Longstaff 1917 [Donaldinidae]
Aclisina formosa, Mark 1912 [Donaldinidae]
Aclisina fugitiva, Perner 1907 [Lophospiridae]
Aclisina golconda, Thein and Nitecki 1974 [Murchisoniidae]
Aclisina grantonensis, Donald 1898 [Donaldinidae]
Aclisina longissima, Whidborne 1896 [Goniasmatidae]
Aclisina marvinwelleri, M.L. Thein and M.H. Nitecki 1974 [Orthonemidae]
Aclisina micula, Longstaff 1917 [Donaldinidae]
Aclisina minima (Shumard and Swallow 1858) [Murchisoniidae]
Aclisina minuta (Stevens 1858) [Murchisoniidae]
Aclisina multicarinata, Pan and Erwin 2002 [Donaldinidae]
Aclisina nana, de Koninck 1881 [Murchisoniidae]
Aclisina northviewensis, Branson 1938 [Murchisoniidae]
Aclisina obscura, J.G. Donald 1902 [Raphistomatidae]
Aclisina ornata, Mark 1912 [Pseudozygopleuridae]
Aclisina parallela, Sayre 1930 [Murchisoniidae]
Aclisina parvula, Donald 1898 [Donaldinidae]
Aclisina pulchra, de Koninck 1881 [Donaldinidae]
Aclisina pumila, Mark 1912 [Donaldinidae]
Aclisina pusilla, Donald 1898 [Donaldinidae]
Aclisina quadrata, Donald 1898 [Donaldinidae]
Aclisina quadrata striatissima, Donald 1898 [Donaldinidae]
Aclisina quadricarinata (Worthen 1884) [Goniasmatidae]
Aclisina regularis, Xi 1980 [Murchisoniidae]
Aclisina robusta (Stevens 1858) [Donaldinidae]
Aclisina selkirkii (Donald 1898) [Murchisoniidae]
Aclisina stevansana (Meek and Worthen 1866) [Donaldinidae]
Aclisina stevensana (Meek and Worthen 1866) [Donaldinidae]
Aclisina striatissima (Donald 1898) [Donaldinidae]
Aclisina striatula (de Koninck 1844) [Murchisoniidae]
Aclisina subsulcata (de Koninck 1844) [Murchisoniidae]
Aclisina subsutra, Wang 1982 [Murchisoniidae]
Aclisina swallovana (Geinitz 1866) [Donaldinidae]
Aclisina swalloviana (Geinitz 1866) [Donaldinidae]
Aclisina swallowiana (Geinitz 1866) [Donaldinidae]
Aclisina terebra, Donald 1898 [Murchisoniidae]
Aclisina turgida, E.K. Yoo 1988 [Murchisoniidae]
Aclisina venusta, Longstaff 1917 [Donaldinidae]
Aclisoides, Donald 1898 [Murchisoniidae]
Aclista, Forster 1856 [Diapriidae]
Aclistoceras, Ruzhencev 1975 [Glaphyritidae]
Aclistochara, Peck 1937 [unclassified genus]
Aclistochara bransoni, Peck 1937 [unclassified species]
Aclistochara clivulata, Peck and Reker 1948 [unclassified species]
Aclistochara kimmeridgensis, Maedler 1953 [unclassified species]
Aclistochara latitruncata, Peck 1937 [unclassified species]
Aclistochara peckii, Rasky 1945 [unclassified species]
Aclistochareae, subfamily, Mädler 1952 [unclassified subfamily]
Aclistomycter, Wilson 1971 [Merycoidodontidae]
Aclistomycter dunagani (Wilson 1971) [Merycoidodontidae]
Aclistomycter middletoni, Wilson 1971 [Merycoidodontidae]
Aclistomycterinae, subfamily, Lander 1998 [Merycoidodontidae]
Aclistothyra, McGinty 1955 [unclassified genus]
Acloeodictya [Reticulosa]
Aclophora, Laseron 1958 [Triphoridae]
Aclophoropsis, Marshall 1983 [Triphoridae]
Aclopinae, subfamily (Blanchard 1850) [unclassified subfamily]
Aclopini, tribe, Blanchard 1850 [Scarabaeidae]
Aclopitae, subfamily, Blanchard 1850 [Scarabaeidae]
Aclypea, Reitter 1884 [Silphidae]
Aclypea altaica (Gebler 1830) [Silphidae]
Aclypea bituberosa (Le Conte 1859) [Silphidae]
Aclypea calva (Reitter 1885) [Silphidae]
Aclypea jacutica (Rjabukhin 1990) [Silphidae]
Aclypea opaca (Linnaeus 1758) [Silphidae]
Aclypea sericea (Zubkov 1833) [Silphidae]
Acmaea, Eschscholtz 1830 [Lottiidae]
Acmaea (Acmaea), Eschscholtz 1830 [Lottiidae]
Acmaea (Collisella) (Dall 1871) [unclassified subgenus]
Acmaea (Conoidacmaea), Habe 1944 [Lottiidae]
Acmaea acra, Woodring 1928 [Lottiidae]
Acmaea actina, Woodring 1928 [Lottiidae]
Acmaea antillarum (Sowerby 1834) [Acmaeidae]
Acmaea campanaeformis (Klipstein 1843) [Lottiidae]
Acmaea depicta (Hinds 1842) [unclassified species]
Acmaea dickersoni, Winkle 1918 [Lottiidae]
Acmaea digitalis, Eschscholtz 1833 [Lottiidae]
Acmaea funiculata (Carpenter 1864) [unclassified species]
Acmaea geometrica (Merriam 1897) [Lottiidae]
Acmaea hannibali, Clark and Arnold 1923 [Lottiidae]
Acmaea insessa (Hinds 1842) [unclassified species]
Acmaea instabilis (Gould 1846) [unclassified species]
Acmaea lepisma, Berry 1940 [unclassified species]
Acmaea limatula (Carpenter 1864) [unclassified species]
Acmaea lineata (Klipstein 1843) [Lottiidae]
Acmaea martinezensis, Dickerson 1914 [unclassified species]
Acmaea mitra, Eschscholtz 1833 [Lottiidae]
Acmaea mitra sookensis, Clark and Arnold 1923 [Lottiidae]
Acmaea oakvillensis, Winkle 1918 [Lottiidae]
Acmaea ochracea (Dall 1871) [unclassified species]
Acmaea ocitatia, Hanna 1924 [Lottiidae]
Acmaea orbignyi, Dall 1909 [Lottiidae]
Acmaea patina, Rathke 1833 [unclassified species]
Acmaea pelta, Eschscholtz 1833 [Lottiidae]
Acmaea persona, Eschesholtz 1833 [Lottiidae]
Acmaea persona vancouverensis, Clark and Arnold 1923 [Lottiidae]
Acmaea poulseni, Ravn 1939 [Lottiidae]
Acmaea punctulata (Gmelin 1791) [Lottiidae]
Acmaea pustulata (Helbling 1779) [Lottiidae]
Acmaea rubella (Fabricius 1780) [Archaeogastropoda]
Acmaea ruckmani, Dickerson 1916 [unclassified species]
Acmaea rudis, Gabb 1868 [unclassified species]
Acmaea scabra (Gould 1846) [unclassified species]
Acmaea scabra limatula, Carpenter 1864 [unclassified subspecies]
Acmaea scutum, Eschscholtz 1833 [Lottiidae]
Acmaea simplex, Dickerson 1917 [unclassified species]
Acmaea soceni, Jekelius 1944 [Lottiidae]
Acmaea sookensis (Clark and Arnold 1923) [unclassified species]
Acmaea subangulata, Nagao 1928 [unclassified species]
Acmaea submesidia, Stilwell et al. 2004 [Lottiidae]
Acmaea tejonensis, Gabb 1868 [unclassified species]
Acmaea testudinalis (Müller 1776) [Archaeogastropoda]
Acmaea vaderensis, Lindberg 1979 [unclassified species]
Acmaea victoriana, Clark and Arnold 1923 [unclassified species]
Acmaea vokesi, Hickman 1980 [unclassified species]
Acmaeadae, family, Forbes 1850 [Patellogastropoda]
Acmaeidae, family (Forbes 1850) [Patellogastropoda]
Acmaeinae, subfamily, Forbes 1850 [Acmaeidae]
Acmaeoblatta, Handlirsch 1906 [Acmaeoblattidae]
Acmaeoblatta carbonaria, Carpenter 1934 [Poroblattinidae]
Acmaeoblatta lanceolata, Handlirsch 1906 [Acmaeoblattidae]
Acmaeoblattidae, family, Durden 1969 [Blattodea]
Acmaeodera, Eschscholtz 1829 [Buprestidae]
Acmaeodera abyssa, Wickham 1912 [Buprestidae]
Acmaeodera antholitha, Heer 1862 [Buprestidae]
Acmaeodera brevicollis, Heer 1862 [Buprestidae]
Acmaeodera burmitina, Cockerell 1917 [Elateridae]
Acmaeodera nigrovittata, Van Dyke 1934 [Buprestidae]
Acmaeodera perreaui, Piton 1940 [Coleoptera]
Acmaeodera schaefferi, Wickham 1912 [Buprestidae]
Acmaeoderimorpha, Alekseev 1993 [Buprestidae]
Acmaeoderimorpha emersa, Alexeev 1996 [Buprestidae]
Acmaeoderimorpha ignota, Alekseev 1993 [Buprestidae]
Acmaeoderina, subtribe, Kerremans 1893 [Buprestidae]
Acmaeoderini, tribe, Kerremans 1893 [Buprestidae]
Acmaeoidea, superfamily, Forbes 1850 [Gastropoda]
Acmaeopleura, Stimpson 1858 [unclassified genus]
Acmaeopleura rotunda, Rathbun 1909 [unclassified species]
Acmarhachis, Resser 1938 [Agnostidae]
Acmarhachis acuta (Kobayashi 1938) [Agnostidae]
Acmarhachis acutus, Kobayashi 1938 [unclassified species]
Acmarhachis apicula (Oepik 1967) [Agnostidae]
Acmarhachis karatauensis, Ergaliev 1980 [Agnostidae]
Acmarhachis kindlei, Westrop and Eoff 2012 [Agnostidae]
Acmarhachis longispinus, Ergaliev 1980 [Agnostidae]
Acmarhachis punctatus, Ergaliev 1980 [Agnostidae]
Acmarhachis typicalis, Resser 1938 [Agnostidae]
Acmarhachis whittingtoni, Westrop and Eoff 2012 [Agnostidae]
Acmarhacis (Resser 1938) [Agnostidae]
Acmarhacis typicalis (Resser 1938) [Agnostidae]
Acmaturris, Woodring 1928 [Turridae]
Acmaturris brisis, Woodring 1928 [Turridae]
Acmaturris comparata, Woodring 1928 [Turridae]
Acmaturris scalida, Woodring 1928 [Turridae]
Acme, Hartman 1821 [Aciculidae]
Acme (Platyla) (Moquin-Tandon 1855) [Aciculidae]
Acme callosiuscula, Andreae 1904 [Aciculidae]
Acmeidae, family (Pollonera 1905) [Architaenioglossa]
Acmena, Candolle 1828 [Myrtaceae]
Acmeodon, Matthew and Granger 1921 [Cimolestidae]
Acmeodon hyoni, Rigby 1980 [Cimolestidae]
Acmeodon secans, Matthew and Granger 1921 [Cimolestidae]
Acmidae, family, Pollonera 1905 [Architaenioglossa]
Acmoniodus, Hussakof and Bryant 1920 [Ptyctodontidae]
Acmophyllum, Sytova 1968 [Ptenophyllidae]
Acmopyle, Pilger 1903 [Podocarpaceae]
Acmopyle antarctica, Florin 1940 [Podocarpaceae]
Acmopyle compactus, Pole 1992 [Podocarpaceae]
Acmopyle engelhardti, Florin 1940 [Podocarpaceae]
Acmopyle florinii, Hill and Carpenter 1991 [Podocarpaceae]
Acmopyle glabra, Hill and Carpenter 1991 [Podocarpaceae]
Acmopyle setiger, Hill and Carpenter 1991 [Podocarpaceae]
Acmopyle tasmanica, Hill and Carpenter 1991 [Podocarpaceae]
Acnemia, Winnertz 1863 [Mycetophilidae]
Acnemia bolsiusi, Meunier 1904 [Mycetophilidae]
Acnemia cyclosoma, Cockerell 1925 [Mycetophilidae]
Acnemia simplex, Cockerell 1921 [Mycetophilidae]
Acobaecardiina, subtribe (Paramonova 1986) [unclassified subtribe]
Acobaecardiini, tribe, Paramonova 1986 [Cardiidae]
Acobaecardium [Pterioida]
Acoblatta, Cockerell 1927 [Adeloblattidae]
Acoblatta argillacea, Cockerell 1927 [Adeloblattidae]
Acocephalites, Meunier 1904 [Archijassidae]
Acocephalites breddini, Meunier 1904 [Archijassidae]
Acocephalus, Germar [Jassidae]
Acocephalus adae, Scudder 1878 [Jassidae]
Acocephalus callosus, Scudder 1890 [Jassidae]
Acocephalus crassiusculus, Heer 1853 [Jassidae]
Acocephalus curtulus, Heer 1853 [Jassidae]
Acocephalus resinosus, Bervoets 1910 [Cicadellidae]
Acochlidea, order, Odhner 1939 [Gastropoda]
Acochlidiidae, family, Odhner 1937 [Acochlidea]
Acochlidioidea, superfamily, Odhner 1937 [Acochlidea]
Acodina, Stauffer [Conodonta]
Acodina concava, Stauffer 1940 [unclassified species]
Acodina cuspidata, Stauffer 1940 [unclassified species]
Acodina inoptinata (Stauffer 1938) [unclassified species]
Acodina lirata, Stauffer 1940 [unclassified species]
Acodina ursa, Stauffer 1940 [unclassified species]
Acodontidae, family, Dzik 1994 [unclassified family]
Acodus, Pander 1856 [Conodonta]
Acodus acutus, Pander 1856 [Conodonta]
Acodus bicostatus, Branson and Mehl 1933 [Conodonta]
Acodus crassus, Pander 1856 [Conodonta]
Acodus curvatus, Branson and Branson 1947 [Conodonta]
Acodus delicatus, Branson and Mehl 1933 [Conodonta]
Acodus deltatus, Lindström 1955 [Conodonta]
Acodus erectus, Pander 1856 [Conodonta]
Acodus firmus, Viira 1970 [Protopanderodontida]
Acodus gladiatus, Lindström 1955 [unclassified species]
Acodus inoptinatus, Stauffer 1938 [unclassified species]
Acodus inornatus, Ethington 1959 [Dapsilodontidae]
Acodus jonesi, Igo and Koike 1967 [Conodonta]
Acodus kechikaensis, Pyle and Barnes 2002 [Conodonta]
Acodus langkawiensis, Igo and Koike 1967 [Panderodontidae]
Acodus latus (Pander 1856) [unclassified species]
Acodus mutatus (Branson and Mehl 1933) [Dapsilodontidae]
Acodus neodeltatus, Pyle and Barnes 2002 [Conodonta]
Acodus oneotensis, Furnish 1938 [Conodonta]
Acodus planus, Pander 1856 [Conodonta]
Acodus sevierensis, Miller 1969 [unclassified species]
Acodus sigmoideus, Pander 1856 [Conodonta]
Acodus similaris, Rhodes 1955 [Conodonta]
Acoela, phylum [Acoelomorpha]
Acoelia, Wu 1991 [Auriculospongiidae]
Acoelia discontinua, Wu 2017 [Auriculospongiidae]
Acoelia norica, Senowbari-Daryan and Link 2016 [Auriculospongiidae]
Acoelia ruida, Wu 1991 [Auriculospongiidae]
Acoeliidae, family, Wu 1991 [Auriculospongiidae]
Acoeliinae, subfamily (Wu 1991) [Auriculospongiidae]
Acoelocalyx, Topsent 1910 [Euplectellidae]
Acoelodidae, family, Ameghino 1901 [Notoungulata]
Acoelodus, Ameghino 1897 [Notoungulata]
Acoelodus connectus, Ameghino 1901 [Notoungulata]
Acoelodus debilitatus, Ameghino 1901 [Notoungulata]
Acoelodus microdon, Ameghino 1901 [Oldfieldthomasiidae]
Acoelodus oppositus, Ameghino 1897 [Notoungulata]
Acoelodus proclivus, Ameghino 1902 [Notoungulata]
Acoelodus terminalis, Ameghino 1902 [Notoungulata]
Acoelohyrax, Ameghino 1902 [Isotemnidae]
Acoelohyrax coalitus (Ameghino 1901) [Isotemnidae]
Acoelohyrax coarctatus (Ameghino 1901) [Isotemnidae]
Acoelohyrax complicatissimus (Ameghino 1904) [Isotemnidae]
Acoelohyrax coronatus, Ameghino 1902 [Isotemnidae]
Acoelohyrax sigma (Ameghino 1901) [Isotemnidae]
Acoelomorpha, Ehlers 1985 [Bilateria]
Acoenites (Latreille 1809) [Ichneumonidae]
Acoenites defunctus, Brues 1906 [Ichneumonidae]
Acoenites statzi, Meunier 1923 [Ichneumonidae]
Acoenitoidae, family, Förster 1869 [Ichneumonidae]
Acoenitus (Latreille 1809) [Ichneumonidae]
Acoenitus lividus, Heer 1849 [Ichneumonidae]
Acoenoniini, tribe, Pritchard 1960 [Cecidomyiidae]
Acoessus, Cope 1881 [Artiodactyla]
Acoessus siderolithicum (Pictet 1857) [Palaeotheriidae]
Acoetidae, family, Kinberg 1856 [Phyllodocida]
Acolaspoides, Moseyko et al. 2010 [Chrysomelidae]
Acolaspoides longipes, Moseyko et al. 2010 [Chrysomelidae]
Acolocrinidae, family, Brett 1980 [unclassified family]
Acolocrinus, Kesling and Paul 1971 [Crinoidea]
Acolosia, Cooper and Grant 1976 [Pontisiidae]
Acolosia anomala, Cooper and Grant 1976 [Pontisiidae]
Acolosia elliptica, Cooper and Grant 1976 [Pontisiidae]
Acolosia exasperata, Cooper and Grant 1976 [Pontisiidae]
Acolosia glabra, Cooper and Grant 1976 [Pontisiidae]
Acolosia lenticula, Sun 1991 [Pontisiidae]
Acolosia magna, Cooper and Grant 1976 [Pontisiidae]
Acolosia recepta, Cooper and Grant 1976 [Pontisiidae]
Acolosiinae, subfamily, Savage 1996 [Pontisiidae]
Acominia [Neogastropoda]
Acompsoceras [Acanthoceratidae]
Acompsoceras americanum, Reeside and Weymouth 1934 [Hoplitidae]
Acompsoceras calabarense, Zaborski 1985 [Acanthoceratidae]
Acompsoceras inconstanus (Schluter 1871) [unclassified species]
Acompsoceras renevieri (Sharpe 1857) [Acanthoceratidae]
Acompsoceras renevierii (Sharpe 1857) [Acanthoceratidae]
Acompsoceras tenue, Collignon 1964 [Acanthoceratidae]
Acompsosaurus, Mehl 1915 [Reptilia]
Acompsosaurus wingatensis, Mehl 1915 [Reptilia]
Acomys, I. Geoffroy 1838 [Muridae]
Acondylacanthus, John and Worthen 1875 [Ctenacanthidae]
Acondylacanthus aequicostatus, Saint John and Worthen 1875 [unclassified species]
Acondylacanthus attenuatus, Davis 1883 [Ctenacanthidae]
Acondylacanthus browni (Branson 1916) [Ctenacanthidae]
Acondylacanthus colei, Davis 1883 [Ctenacanthidae]
Acondylacanthus distans (M'Coy 1848) [Ctenacanthidae]
Acondylacanthus gracilis, Saint John and Worthen 1875 [unclassified species]
Acondylacanthus gracillimus (Newberry and Worthen 1866) [Ctenacanthidae]
Acondylacanthus mudgianus, Saint John and Worthen 1883 [unclassified species]
Acondylacanthus nuperus, St John and Worthen 1883 [Ctenacanthidae]
Acondylacanthus rectus, Saint John and Worthen 1883 [unclassified species]
Acondylacanthus tenuistriatus, Davis 1883 [Ctenacanthidae]
Acondylacanthus xiphias, Saint John and Worthen 1883 [unclassified species]
Aconeceras, Hyatt 1903 [Oppeliidae]
Aconeceras (Aconeceras), Hyatt 1903 [unclassified subgenus]
Aconeceras (Aconeceras) nisus (d'Orbigny 1841) [unclassified species]
Aconeceras (Gyaloceras) (Whitehouse 1927) [Oppeliidae]
Aconeceras (Gyaloceras) smithi (Whitehouse 1927) [Oppeliidae]
Aconeceras austronisoides, Brunnschweiler 1959 [unclassified species]
Aconeceras haughi, Sarasin 1893 [unclassified species]
Aconeceras haugi (Sarasin 1893) [Oppeliidae]
Aconeceras nisoides (Sarasin 1893) [Oppeliidae]
Aconeceras nisus (d'Orbigny 1841) [Oppeliidae]
Aconeceras walshense (Etheridge 1892) [Oppeliidae]
Aconeceras whitehousei, Brunnschweiler 1959 [unclassified species]
Aconeceratidae, family, Spath 1923 [Oppeliidae]
Aconeceratinae, subfamily (Spath 1923) [Oppeliidae]
Acontheus, Angelin 1852 [Corynexochida]
Acontias, Cuvier 1817 [unclassified genus]
Acontias meleagris, Linneaus 1758 [unclassified species]
Acontias percivali, Loveridge 1935 [unclassified species]
Acontias plumbeus, Bianconi 1849 [unclassified species]
Acontiidae, family, Gray 1845 [Squamata]
Acontinae, subfamily, Gray 1845 [unclassified subfamily]
Acontiodus, Pander 1856 [unclassified genus]
Acontiodus cooperi, Sweet and Bergström 1962 [Cornuodontidae]
Acontiodus hamari, Igo and Koike 1967 [Dapsilodontidae]
Acontiodus iowensis, Fürnish 1938 [unclassified species]
Acontiodus latus, Pander 1856 [Acontiodus]
Acontiodus malayensis, Igo and Koike 1967 [Acontiodus]
Acontiodus reclinatus, Lindström 1955 [unclassified species]
Acontiodus rectus, Lindstrom 1955 [Acontiodus]
Acontiodus semisymmetricus, Hamar 1966 [Conodonta]
Acontiodus staufferi, Furnish 1938 [Cornuodontidae]
Acophyllum, Zalessky 1929 [unclassified genus]
Acophyllum wolzi, Zalessky 1929 [unclassified species]
Acoraceae, family, I.I. Martinov 1820 [Arales]
Acorales, order, Link 1835 [unclassified order]
Acoropsis, Conwentz 1886 [unclassified genus]
Acoropsis minor, Conwentz 1886 [unclassified species]
Acorylus, Olsson and Harbison 1953 [Tellinidae]
Acorylus gouldii (Hanley 1846) [Tellinidae]
Acosarina, Cooper and Grant 1969 [Schizophoriidae]
Acosarina aethopa (Grant 1993) [Schizophoriidae]
Acosarina antesulcata, Waterhouse 1983 [Schizophoriidae]
Acosarina avushensis (Sokolskaja 1965) [Schizophoriidae]
Acosarina baylorensis (King 1931) [Schizophoriidae]
Acosarina circular, Xu 1987 [Schizophoriidae]
Acosarina dorashamensis (Sokolskaja 1965) [Schizophoriidae]
Acosarina dorsisulcata, Cooper and Grant 1969 [Schizophoriidae]
Acosarina dunbari, Cooper and Grant 1976 [Schizophoriidae]
Acosarina fecunda, Liao 1979 [Schizophoriidae]
Acosarina grandis, Chen and Shi 2006 [Schizophoriidae]
Acosarina incisiva (Waagen 1884) [Schizophoriidae]
Acosarina indica (Waagen 1884) [Schizophoriidae]
Acosarina janiceps (Waagen 1884) [Schizophoriidae]
Acosarina juresanensis (Tschernyschew 1902) [Schizophoriidae]
Acosarina kanmerai, Yanagida and Nakornsri 1999 [Schizophoriidae]
Acosarina mesoplatys (King 1931) [Schizophoriidae]
Acosarina minuta (Abich 1878) [Schizophoriidae]
Acosarina monocosta, Li 1986 [Schizophoriidae]
Acosarina peculiaris (Girty 1931) [Schizophoriidae]
Acosarina rectimarginata, Cooper and Grant 1976 [Schizophoriidae]
Acosarina regularis, Liao 1980 [Schizophoriidae]
Acosarina strophiria, Xu and Grant 1994 [Schizophoriidae]
Acosarina tumita, Zeng et al. 1995 [Schizophoriidae]
Acoscinopleura [Cheilostomata]
Acosmanura, superfamily, Savage 1973 [Anura]
Acosmanura (Savage 1973) [Anura]
Acosmelytridae, family, Tillyard 1931 [Protelytroptera]
Acosmelytron, Tillyard 1931 [Permelytridae]
Acosmelytron acutum, Tillyard 1931 [Permelytridae]
Acosmelytron delicatum, Tillyard 1931 [Permelytridae]
Acosmelytron elongatum, Tillyard 1931 [Permelytridae]
Acosmia, Chen and Zhou 1997 [Scalidophora]
Acosmia maotiania, Chen and Zhou 1997 [Scalidophora]
Acosmoblatta, Handlirsch 1906 [Archimylacridae]
Acosmoblatta eakiniana (Scudder 1895) [Archimylacridae]
Acosmoblatta permacra (Scudder 1895) [Archimylacridae]
Acosmostroma, Stock 1998 [Densastromatidae]
Acostaea, d'Orbigny 1851 [unclassified genus]
Acostaeidae, family, Morrison 1973 [unclassified family]
Acostasaurus, Gomez-Perez and Noe 2011 [unclassified genus]
Acostasaurus pavachoquensis, Gomez-Perez and Noe 2011 [unclassified species]
Acostina [Foraminifera]
Acotherulum, P. Gervais 1850 [Cebochoeridae]
Acotherulum campichii (F.J. Pictet 1855) [Cebochoeridae]
Acotherulum pumilum, Stehlin 1908 [Cebochoeridae]
Acotherulum quercyi, Stehlin 1908 [Cebochoeridae]
Acotherulum saturninum, Gervais 1850 [Cebochoeridae]
Acotripus [Nassellaria]
Acotripus sphaericus, Ozvoldova 1988 [Sethocapsidae]
Acourtia, Cockerell 1921 [Ichneumonidae]
Acourtia perplexa, Cockerell 1921 [Ichneumonidae]
Acoxylon, Velenovsky and Viniklar 1929 [unclassified genus]
Acoxylon suspectum, Velenovsky and Viniklar 1929 [unclassified species]
Acozamites, Zalessky 1936 [unclassified genus]
Acozamites elegans, Zalessky 1936 [unclassified species]
Acrangiophyllum, Mamay 1955 [unclassified genus]
Acrangiophyllum pendulata (Lesley 1890) [unclassified species]
Acrania, subphylum, Haeckel [unclassified subphylum]
Acrania, subclass (Haeckel) [unclassified subclass]
Acrantophis, Jan 1860 [Boidae]
Acratia, Delo 1930 [Acratiidae]
Acratia (Cooperuna) () [Acratiidae]
Acratia (Cooperuna) tenuis, Kozur 1985 [Acratiidae]
Acratia caeracella, Forel 2017 [unclassified species]
Acratia candyae, Forel 2012 [Acratiidae]
Acratia changxingensis (Shi 1987) [Acratiidae]
Acratia filippovskaensis, Kotschetkova 1972 [Acratiidae]
Acratia goemeryi (Kozur 1970) [unclassified species]
Acratia goemoeryi, Kozur 1970 [Acratiidae]
Acratia guangyuanensis, Xie 1989 [Acratiidae]
Acratia hamadai, Tanaka et al. 2013 [Acratiidae]
Acratia hungarica, Kozur 1985 [Acratiidae]
Acratia jeanvannieri, Forel 2013 [Acratiidae]
Acratia kollmanni, Forel 2017 [unclassified species]
Acratia lucea, Maillet et al. 2013 [Acratiidae]
Acratia nagyvisnyoensis, Forel 2013 [Acratiidae]
Acratia obesa, Gusseva 1972 [Acratiidae]
Acratia okumurai, Tanaka 2013 [Acratiidae]
Acratia olivifera, Chen 1958 [Acratiidae]
Acratia permiana, Zalanyi 1974 [Acratiidae]
Acratia pervagata, Forel 2015 [Acratiidae]
Acratia posteroinclinata, Kozur 1985 [Acratiidae]
Acratia posthungarica, Kozur 1985 [Acratiidae]
Acratia pulchra, Posner 1951 [Acratiidae]
Acratia qinglongensis, Wang 1978 [Acratiidae]
Acratia recurvata, Cordell 1952 [unclassified species]
Acratia schreteri, Kozur 1985 [Acratiidae]
Acratia serbianella, Crasquin 2010 [Acratiidae]
Acratia simplex, Kesling and Chilman 1978 [unclassified species]
Acratia siratchoica, Egorov 1953 [Acratiidae]
Acratia striatula, Shi 1982 [Geroiidae]
Acratia subfusiformis, Wang 1978 [Acratiidae]
Acratia subgusevae, Wang 2005 [Acratiidae]
Acratia subularis, Gusseva 1972 [Acratiidae]
Acratia suksuensis, Gusseva 1972 [unclassified species]
Acratia symmetrica, Hao 1992 [Acratiidae]
Acratia triassica, Kozur 1970 [Acratiidae]
Acratia typica, Delo 1930 [Acratiidae]
Acratia visnyoensis, Kozur 1985 [Acratiidae]
Acratia zhongyingensis, Wang 1978 [Acratiidae]
Acratiidae, family, Gründel 1962 [Podocopida]
Acratiinae, subfamily, Gruendel 1962 [Acratiidae]
Acratina [Bairdiidae]
Acratina diffusa, Schneider 1959 [Bairdiidae]
Acratina gusevae, Kozur 1985 [Bairdiidae]
Acratina nostorica, Monostori 1994 [Bairdiidae]
Acratina nostrica (Monostori 1994) [Bairdiidae]
Acratina suprapermiana, Kozur 1985 [Bairdiidae]
Acratinella [Acratiidae]
Acratinella obscura, Belousova 1965 [Acratiidae]
Acratinella posterospinosa, Kozur 1985 [Acratiidae]
Acratocnus, Anthony 1916 [Megalonychidae]
Acravincula [Palaeocopida]
Acreagris, Koch and Berendt 1854 [Margarodidae]
Acreagris crenata, Koch and Berendt 1854 [Matsucoccidae]
Acrecebus, Kay and Cozzuol 2006 [Cebidae]
Acrecebus fraileyi, Kay and Cozzuol 2006 [Cebidae]
Acregoliath, M. Richter 1989 [unclassified genus]
Acregoliath rancii, M. Richter 1989 [unclassified species]
Acremonites, Pia 1927 [unclassified genus]
Acremonites succineus, Caspary 1927 [unclassified species]
Acremylodon, A. Mones 1986 [unclassified genus]
Acremylodon campbelli (Frailey 1986) [unclassified species]
Acreodi, order, Matthew 1909 [Mammalia]
Acreotrichites, Cockerell 1917 [Bombyliidae]
Acreotrichites scopulicornis, Cockerell 1917 [Bombyliidae]
Acresuchus, Souza-Filho et al. 2019 [unclassified genus]
Acresuchus pachytemporalis, Souza-Filho et al. 2019 [unclassified species]
Acreuciroa, Thiele 1931 [Verticordiidae]
Acrhelia, Milne-Edwards and Haime 1849 [Oculinidae]
Acrhelia horrescens (Dana 1846) [Oculinidae]
Acriaster, Smith 1991 [Cassiduloida]
Acriaster sergipensis, Smith 1991 [unclassified species]
Acriclymenia, Bogoslovsky 1975 [Carinoclymeniidae]
Acrididae, family (Latreille 1802) [Orthoptera]
Acrididea, infraorder, MacLeay 1821 [Orthoptera]
Acrididea, superfamily (MacLeay 1821) [Orthoptera]
Acridiidae, family (Latreille 1802) [Orthoptera]
Acridiites, Heer 1865 [Orthoptera]
Acridiites deperditus, Heer 1865 [Locustidae]
Acridiites liasinus, Heer 1865 [Orthoptera]
Acridinae, subfamily, Latreille 1802 [Acrididae]
Acridiodea, suborder (MacLeay 1821) [Orthoptera]
Acridioidea, suborder (MacLeay 1821) [Orthoptera]
Acridiopsis, Bode 1953 [Acrididae]
Acridiopsis spoliata, Bode 1953 [Acrididae]
Acridites (Germar 1842) [Protorthoptera]
Acridites carbonarius (Germar 1842) [Protorthoptera]
Acridites formosus, Goldenberg 1873 [Insecta]
Acridites goldenbergi, Kliver 1886 [Insecta]
Acridites priscus, Andrée 1864 [Lithomanteidae]
Acriditis, Germar 1842 [Blattodea]
Acriditis carbonatus, Germar 1842 [Protorthoptera]
Acridium (Geoffroy 1762) [Tetrigidae]
Acridium (Gryllus), Hope 1847 [Tetrigidae]
Acridium (Gryllus) barthelemyi, Hope 1847 [Tetrigidae]
Acridium barthelemyi (Hope 1847) [Tetrigidae]
Acridium differentiale, Thomas 1865 [Acrididae]
Acridium oeningense, Scudder 1895 [Acrididae]
Acridodea, infraorder (MacLeay 1821) [Orthoptera]
Acridoidea, superfamily, Latreille 1802 [Orthoptera]
Acridomima, Handlirsch 1906 [Locustidae]
Acridomima deperditus (Heer 1865) [Locustidae]
Acridomorpha [Orthoptera]
Acridotheres, Vieillot 1816 [unclassified genus]
Acrilla, H. Adams and A. Adams 1860 [Epitoniidae]
Acrilla (Ferminoscala) (Dall 1908) [Epitoniidae]
Acrilla (Ferminoscala) aragoensis, Durham 1937 [unclassified species]
Acrilla (Ferminoscala) atwoodi (Dall 1908) [unclassified species]
Acrilla (Ferminoscala) becki, Durham 1937 [unclassified species]
Acrilla (Ferminoscala) berthiaumei, Durham 1937 [unclassified species]
Acrilla (Ferminoscala) dickersoni (Durham 1937) [Epitoniidae]
Acrilla (Ferminoscala) durhami, Zinsmeister 1983 [unclassified species]
Acrilla (Ferminoscala) lincolnensis (Weaver 1916) [unclassified species]
Acrilla (Ferminoscala) pakistanica, Eames 1952 [Epitoniidae]
Acrilla (Ferminoscala) pinolensis (B. L. Clark 1918) [unclassified species]
Acrilla (Ferminoscala) tejonensis (Dickerson 1916) [unclassified species]
Acrilla (Undiscala) (de Boury 1909) [Epitoniidae]
Acrilla (Undiscala) lolakensis, Durham 1937 [unclassified species]
Acrilla (Undiscala) olympicensis, Durham 1937 [unclassified species]
Acrilla (Undiscala) soriensis, Eames 1952 [Epitoniidae]
Acrilla (Undiscala) washingtonensis (Weaver 1916) [unclassified species]
Acrilla affinis, Deshayes 1861 [Epitoniidae]
Acrilla dickersoni, Durham 1937 [Epitoniidae]
Acrilla gallica, de Boury 1887 [Epitoniidae]
Acrilla procerus, Zinsmeister 1983 [unclassified species]
Acrilla unilineata (Heilprin 1880) [Epitoniidae]
Acrilloscala, Sacco 1890 [Epitoniidae]
Acrimeroceras, Becker 1993 [Dimeroceratidae]
Acrioceras, Hyatt 1900 [Ancyloceratidae]
Acrioceras (Acrioceras), Hyatt 1900 [Ancyloceratidae]
Acrioceras (Acrioceras) zulu, Klinger and Kennedy 1992 [Ancyloceratidae]
Acrioceras bonarellii, Leanza 1970 [Acrioceratidae]
Acrioceras hamlini (Anderson 1938) [Ancyloceratidae]
Acrioceras meriani (Ooster 1860) [Ancyloceratidae]
Acrioceras nagerai, Leanza 1970 [Acrioceratidae]
Acrioceras starrkingi, Anderson 1938 [Acrioceratidae]
Acrioceras tabarelli (Astier 1851) [Ancyloceratidae]
Acrioceras vespertinum (Anderson 1938) [Ancyloceratidae]
Acrioceras voyanum, Anderson 1938 [Ancyloceratidae]
Acrioceratidae, family, Vermeulen 2004 [Ammonitida]
Acris, Dumeril and Bibron 1841 [Hylidae]
Acris crepitans, Baird 1854 [Hylidae]
Acris gryllus (Le Conte 1825) [Hylidae]
Acristatherium, Hu et al. 2010 [Mammalia]
Acristatherium yanensis, Hu et al. 2010 [Mammalia]
Acristavus, Gates et al. 2011 [Hadrosauridae]
Acristavus gagslarsoni, Gates et al. 2011 [Hadrosauridae]
Acritarcha, Evitt 1963 [Eukaryota]
Acritodromum, Upchurch and Dilcher 1990 [Magnoliopsida]
Acritodromum ellipticum, Upchurch and Dilcher 1990 [unclassified species]
Acritohippus, Kelly 1995 [Equidae]
Acritohippus isonesus (Cope 1889) [Equidae]
Acritohippus quinni, Kelly 1995 [Equidae]
Acritohippus stylodontus (Merriam 1919) [Equidae]
Acritohippus tertius (Osborn 1918) [Equidae]
Acritolepidae, family, Valiukevicius and Burrow 2005 [Ischnacanthiformes]
Acritoparamys, Korth 1984 [Ischyromyidae]
Acritoparamys atavus (Jepsen 1937) [Ischyromyidae]
Acritoparamys atwateri (Loomis 1907) [Ischyromyidae]
Acritoparamys francesi (Wood 1962) [Ischyromyidae]
Acritoparamys pattersoni (Wood 1962) [Ischyromyidae]
Acritoparamys wutui, Tong and Dawson 1995 [Ischyromyidae]
Acritoparamys wyomingensis (Wood 1959) [Ischyromyidae]
Acritophiomys, Sallam et al. 2012 [Rodentia]
Acritophiomys bowni, Sallam et al. 2012 [Rodentia]
Acritorhyphus, Bode 1953 [Ptychopteridae]
Acritorhyphus ramosus, Bode 1953 [Ptychopteridae]
Acritosia, Cooper and Grant 1969 [Cyclacanthariidae]
Acritosia magna, Cooper and Grant 1969 [Cyclacanthariidae]
Acritosia magnifica, Cooper and Grant 1975 [Cyclacanthariidae]
Acritosia ogamensis, Tazawa 2016 [Cyclacanthariidae]
Acritosia peculiaris, Cooper and Grant 1975 [Cyclacanthariidae]
Acritosia silicica, Cooper and Grant 1975 [Cyclacanthariidae]
Acritosia solida, Cooper and Grant 1975 [Cyclacanthariidae]
Acritosia teguliferoides (King 1931) [Cyclacanthariidae]
Acritosia vestibula, Cooper and Grant 1975 [Cyclacanthariidae]
Acrobata, Desmarest 1820 [Macropina]
Acrobates, Desmarest 1818 [Acrobatidae]
Acrobates pygmaeus (Shaw 1794) [Acrobatidae]
Acrobatidae, family, Aplin 1987 [Diprotodontia]
Acrobelesia, Cooper 1983 [unclassified genus]
Acrobelesia cooperi, Hondt 1976 [Acrobelesia]
Acrobotrys, Haeckel 1881 [Cannobotryidae]
Acrobrochus, Cooper 1983 [Terebratulidae]
Acrobrochus aldingi (Tate 1880) [unclassified species]
Acrobrochus blochmanni, Jackson 1912 [Terebratulidae]
Acrobrochus hendleri, Cooper 1982 [Terebratulidae]
Acrobrochus landonensis (Thomson 1918) [Terebratulidae]
Acrobrochus tateana (Tenison-Woods 1878) [unclassified species]
Acrobrochus vema, Cooper 1973 [Terebratulidae]
Acrocanites, Schindewolf 1922 [Prodromitidae]
Acrocanites disparilis, Korn et al. 2010 [Prodromitidae]
Acrocanitidae, family, Korn and Ebbignausen 2007 [Goniatitida]
Acrocanthosaurus, Stovall and Langston 1950 [Carcharodontosauridae]
Acrocanthosaurus altispinax, Paul 1988 [Reptilia]
Acrocanthosaurus atokensis, Stovall and Langston 1950 [Carcharodontosauridae]
Acrocarpus, Schenk 1867 [unclassified genus]
Acrocarpus cuneatus, Schenk 1867 [unclassified species]
Acrocephalaspina, Ergaliev 1980 [Ptychopariida]
Acrocephalaspina insueta, Ergaliev 1980 [Ptychopariida]
Acrocephalaspina longa, Ergaliev 1980 [Ptychopariida]
Acrocephalaspis, Ivshin 1953 [Ptychopariida]
Acrocephalaspis orientalis, Lazarenko 1966 [Ptychopariida]
Acrocephalella, Rozova 1963 [Acrocephalitidae]
Acrocephalella granulosa, Rozova 1963 [Acrocephalitidae]
Acrocephalidae, family, Salvin 1882 [unclassified family]
Acrocephalina, Troedsson 1937 [Ptychopariida]
Acrocephalina acuta, Troedsson 1937 [Ptychopariida]
Acrocephalina borealica, Lazarenko 1960 [Acrocephalitidae]
Acrocephalites, Wallerius 1895 [Acrocephalitidae]
Acrocephalites americanus, Walcott 1916 [unclassified species]
Acrocephalites aoris, Walcott 1916 [unclassified species]
Acrocephalites aster, Walcott 1916 [unclassified species]
Acrocephalites borealicus (Lazarenko 1960) [Acrocephalitidae]
Acrocephalites glomeratus, Walcott 1916 [unclassified species]
Acrocephalites haynesi, Walcott 1916 [unclassified species]
Acrocephalites insignis, Walcott 1916 [unclassified species]
Acrocephalites lataegenae, Wilson 1949 [Acrocephalitidae]
Acrocephalites majus, Walcott 1916 [unclassified species]
Acrocephalites militans, Lermontova 1940 [Acrocephalitidae]
Acrocephalites multisegmentus, Walcott 1916 [unclassified species]
Acrocephalites redivivus, Rozova 1964 [Acrocephalitidae]
Acrocephalites reductus, Rozova 1964 [Acrocephalitidae]
Acrocephalites trifossatus, Mason 1935 [unclassified species]
Acrocephalites tutus, Walcott 1916 [unclassified species]
Acrocephalites vulcanus (Billings 1861) [unclassified species]
Acrocephalitidae, family, Hupé 1953 [Ptychopariida]
Acrocephalops, Poulson 1927 [Bolaspididae]
Acrocephalops insignis (Walcott 1916) [unclassified species]
Acrocephalops nitida, Resser 1935 [unclassified species]
Acrocephalops tutus (Walcott 1916) [unclassified species]
Acrocephalus, Naumann and Naumann 1811 [unclassified genus]
Acrocephalus caffer (Sparrman 1786) [unclassified species]
Acrocephalus kerearako, Holyoak 1974 [unclassified species]
Acrocephalus luscinia (Quoy and Gaimard 1830) [unclassified species]
Acrocephalus luscinius (Quoy and Gaimard 1830) [unclassified species]
Acrocephalus mendanae, Tristram 1883 [unclassified species]
Acrocephalus rodericanus (Newton 1865) [unclassified species]
Acrocephalus taiti, Ogilvie-Grant 1913 [unclassified species]
Acrocera, Meigen 1803 [Acroceridae]
Acrocera hirsuta, Scudder 1877 [Mythicomyiidae]
Acroceridae, family, Leach 1815 [Diptera]
Acrocerinae, subfamily, Leach 1815 [Acroceridae]
Acrocheilus, Agassiz 1855 [unclassified genus]
Acrocheilus latus (Cope 1870) [unclassified species]
Acrochordiceras, Hyatt 1877 [Acrochordiceratidae]
Acrochordiceras (Acrochordiceras), Hyatt 1877 [Acrochordiceratidae]
Acrochordiceras (Acrochordiceras) kiparisovae, Zharnikova 1981 [Acrochordiceratidae]
Acrochordiceras (Epacrochordiceras) (L. F. Spath 1934) [Acrochordiceratidae]
Acrochordiceras (Epacrochordiceras) korobkovi, Zharnikova 1981 [Acrochordiceratidae]
Acrochordiceras (Paracrochordiceras) (L. F. Spath 1934) [Acrochordiceratidae]
Acrochordiceras (Paracrochordiceras) americanum, McLearn 1946 [Acrochordiceratidae]
Acrochordiceras alternans, Smith 1914 [Acrochordiceratidae]
Acrochordiceras asseretoi, Fantini Sestini 1988 [Acrochordiceratidae]
Acrochordiceras atavum, Waagen 1895 [Acrochordiceratidae]
Acrochordiceras balarama, Diener 1895 [Acrochordiceratidae]
Acrochordiceras bithynicum, Arthaber 1915 [Acrochordiceratidae]
Acrochordiceras carlottense, Whiteaves 1889 [Juvavitidae]
Acrochordiceras carolinae, Mojsisovics 1882 [Acrochordiceratidae]
Acrochordiceras compressum, Waagen 1895 [Prionitidae]
Acrochordiceras coronatum, Waagen 1895 [Prionitidae]
Acrochordiceras coyotense, Bucher 1992 [Acrochordiceratidae]
Acrochordiceras damesi (Noetling 1880) [Acrochordiceratidae]
Acrochordiceras dimidiatum, Waagen 1895 [Acrochordiceratidae]
Acrochordiceras distractum, Waagen 1895 [Prionitidae]
Acrochordiceras endrissi, Arthaber 1915 [unclassified species]
Acrochordiceras enode, Hauer 1892 [Acrochordiceratidae]
Acrochordiceras erucosum, Arthaber 1896 [Acrochordiceratidae]
Acrochordiceras fischeri, Mojsisovics 1882 [Acrochordiceratidae]
Acrochordiceras foltzense, Smith 1914 [Beyrichitidae]
Acrochordiceras halili, Toula 1896 [Acrochordiceratidae]
Acrochordiceras hatschekii (Diener 1907) [Acrochordiceratidae]
Acrochordiceras haueri, Arthaber 1911 [Acrochordiceratidae]
Acrochordiceras hyatti, Meek 1877 [Acrochordiceratidae]
Acrochordiceras inyoense, Smith 1914 [Acrochordiceratidae]
Acrochordiceras ippeni, Arthaber 1911 [Acrochordiceratidae]
Acrochordiceras joharense, Diener 1895 [Acrochordiceratidae]
Acrochordiceras lingyunense, Zhao and Wang 1974 [Acrochordiceratidae]
Acrochordiceras orientale, Zharnikova 1981 [Acrochordiceratidae]
Acrochordiceras pacificum, Zharnikova 1985 [unclassified species]
Acrochordiceras portisi, Martelli 1906 [Acrochordiceratidae]
Acrochordiceras pustericum, Mojsisovics 1882 [Acrochordiceratidae]
Acrochordiceras simplex, Shevyrev 1968 [Acrochordiceratidae]
Acrochordiceras subrotundum, Shevyrev 1968 [Acrochordiceratidae]
Acrochordiceras undatum (Arthaber 1896) [Acrochordiceratidae]
Acrochordiceras undatus, Arthaber 1896 [Acrochordiceratidae]
Acrochordiceratidae, family, G. v. Arthaber 1911 [Ceratitida]
Acrochordidae, family, Bonaparte 1840 [Squamata]
Acrochordinae, subfamily (Bonaparte 1840) [unclassified subfamily]
Acrochordoidea, superfamily, McDowell 1979 [Squamata]
Acrochordonia, Schrammen 1901 [Theonellidae]
Acrochordonia auricula, Schrammen 1910 [Theonellidae]
Acrochordonia bifurcata, Hurcewicz 1966 [Theonellidae]
Acrochordonia coilorhopalota, Defretin-Lefranc 1960 [Theonellidae]
Acrochordonia irregularis, Ulbrich 1974 [Theonellidae]
Acrochordonia ramosa, Schrammen 1901 [Theonellidae]
Acrochordonia regularis, Hurcewicz 1966 [Theonellidae]
Acrochordonia stellata, Lagneau-Herenger 1962 [Theonellidae]
Acrochordoniinae, subfamily, Schrammen 1910 [Theonellidae]
Acrochordus, Hornstedt 1787 [Acrochordidae]
Acrochordus dehmi, Hoffstetter 1964 [Acrochordidae]
Acrochordus granulatus, Schneider 1799 [unclassified species]
Acrocidaris [Pseudodiadematidae]
Acrocirridae, family, Banse 1969 [Terebellida]
Acrocodia, Goldman 1913 [Tapiridae]
Acrocodia indica (Desmarest 1819) [Tapiridae]
Acrocoelites [Megateuthididae]
Acrocoelites (Acrocoelites), Lissajous 1915 [Megateuthididae]
Acrocoelites (Acrocoelites) riegrafi, Doyle 1992 [Megateuthididae]
Acrocoelites bobeti, Lissajous 1927 [Megateuthididae]
Acrocoelites brevisulcatus (Quenstedt 1848) [Megateuthididae]
Acrocoelites conoideus (Oppel 1856) [Megateuthididae]
Acrocoelites ilminstrensis (Phillips 1867) [Megateuthididae]
Acrocoelites inaequistriatus (Simpson 1855) [Megateuthididae]
Acrocoelites levidensis (Simpson 1855) [Megateuthididae]
Acrocoelites oxyconus (Hehl 1831) [Megateuthididae]
Acrocoelites pyramidalis (Munster 1831) [Megateuthididae]
Acrocoelites riegrafi (Doyle 1992) [Megateuthididae]
Acrocoelites rostriformis (Theodori 1837) [Megateuthididae]
Acrocoelites subtenuis (Simpson 1855) [Megateuthididae]
Acrocoelites tripartitus (von Schlotheim 1820) [Megateuthididae]
Acrocoelites vulgaris (Young and Bird 1822) [Megateuthididae]
Acrocoelites wrighti (Oppel 1856) [Megateuthididae]
Acrocoelum [Mathildidae]
Acrocoila, Mueller 1877 [unclassified genus]
Acrocoila anodonta, Mueller 1877 [unclassified species]
Acrocolpus, Cossmann 1895 [Cephalaspida]
Acrocosmia [Coelostylinidae]
Acrocosmia regularia, Pan 1982 [Coelostylinidae]
Acrocrinidae, family, Wachsmut and Springer 1885 [Crinoidea]
Acrocrinus, Yandell 1855 [Monobathrida]
Acrocubus, Haeckel 1881 [Acanthodesmiidae]
Acroculia, Phillips 1841 [Platyceratidae]
Acroculia angulata, Hall 1852 [Platyceratidae]
Acroculia angustata (Phillips 1836) [Platyceratidae]
Acroculia antiquata, Salter 1861 [Craspedostomatidae]
Acroculia compressa (Goldfuss 1832) [Platyceratidae]
Acroculia contorta, Römer 1843 [Platyceratidae]
Acroculia contortus, Römer 1843 [unclassified species]
Acroculia erectum, J. Hall 1843 [Platyceratidae]
Acroculia haliotis, de Sowerby and Murchison 1839 [Platyceratidae]
Acroculia naticoides, Roemer 1852 [Platyceratidae]
Acroculia niagarensis, Hall 1852 [Platyceratidae]
Acroculia protei, Oehlert 1883 [Orthonychiidae]
Acroculia sigmoidale, Phillips 1841 [Capulidae]
Acroculia sigmoidalis, Phillips 1841 [Platyceratidae]
Acroculia sileni, D. Oehlert 1883 [Orthonychiidae]
Acroculia trigona (Goldfuss 1844) [Platyceratidae]
Acroculia uncinata, Roemer 1852 [Platyceratidae]
Acroculia zinkeni, Römer 1843 [Platyceratidae]
Acrocyathinae, subfamily, Hill 1981 [Lithostrotionidae]
Acrocyathus, d'Orbigny 1849 [Lithostrotionidae]
Acrocyon, Ameghino 1887 [Borhyaenidae]
Acrocyon eguianus, Mercerat 1891 [Borhyaenidae]
Acrocyon equianus, A. Mercerat 1891 [unclassified species]
Acrocyon patagonensis, A. Mercerat 1891 [Borhyaenidae]
Acrocyon riggsi (W. Sinclair 1930) [Borhyaenidae]
Acrocyon sectorius, Ameghino 1887 [Borhyaenidae]
Acrocythere, Neale 1960 [Progonocytheridae]
Acrodelphidae, family, Abel 1905 [Cetacea]
Acrodelphinae, subfamily, Abel 1905 [Acrodelphinidae]
Acrodelphinidae, family (Abel 1905) [Cetacea]
Acrodelphis, Abel 1900 [Cetacea]
Acrodelphis bakersfieldensis, Wilson 1935 [Cetacea]
Acrodelphis cristatus (Probst 1886) [Cetacea]
Acrodelphis denticulatus (Probst 1886) [Cetacea]
Acrodelphis dubius (Brandt 1873) [Cetacea]
Acrodelphis fuchsi (Brandt 1873) [Kentriodontidae]
Acrodelphis fuchsii (Brandt 1873) [Kentriodontidae]
Acrodelphis karreri (Brandt 1873) [Cetacea]
Acrodelphis krahuletzi, Abel 1900 [Cetacea]
Acrodelphis letochae (Brandt 1873) [Cetacea]
Acrodelphis lophogenius (Valenciennes 1862) [Cetacea]
Acrodelphis macrognathus (Brandt 1873) [Cetacea]
Acrodelphis macrospondylus, Abel 1905 [Cetacea]
Acrodelphis ombonii (Longhi 1898) [Dalpiazinidae]
Acrodelphis scaldensis (Du Bus 1872) [Cetacea]
Acrodelphis scheynensis (Du Bus 1872) [Eurhinodelphinidae]
Acrodelphis squalodontoides (Capellini 1878) [Kentriodontidae]
Acrodenta, Dutuit 1976 [Captorhinidae]
Acrodenta irerhi, Dutuit 1976 [Captorhinidae]
Acrodirotes, Opik 1967 [Ptychopariida]
Acrodobatis, Leidy 1877 [Ginglymostomatidae]
Acrodobatis obliquus, Leidy 1877 [Ginglymostomatidae]
Acrodobatis serra, Leidy 1877 [Ginglymostomatidae]
Acrodonchus, Fraas 1889 [Heterodontidae]
Acrodonta, Cope 1864 [Squamata]
Acrodontidae, family, Casier 1959 [Hybodontiformes]
Acrodontinae, subfamily, Maisey 1989 [Hybodontidae]
Acrodontopsis, Alifanov 2009 [Changjiangosauridae]
Acrodontopsis robustus, Alifanov 2009 [Changjiangosauridae]
Acrodus, Agassiz 1838 [Acrodontidae]
Acrodus acutus, Agassiz 1839 [Acrodontidae]
Acrodus alexandrae, Wemple 1906 [Acrodontidae]
Acrodus althausii, Münster 1840 [Ctenacanthiformes]
Acrodus anningiae, Agassiz 1837 [Acrodontidae]
Acrodus arietis, Quenstedt 1858 [Acrodontidae]
Acrodus bicarenatus (Bassani 1886) [Chondrichthyes]
Acrodus bicarinatus, Bassani 1886 [Chondrichthyes]
Acrodus braunii, Agassiz 1839 [Acrodontidae]
Acrodus creodontus (Wemple 1906) [unclassified species]
Acrodus cretaceus, Dixon 1850 [unclassified species]
Acrodus cuneocostatus, Cuny et al. 2001 [Acrodontidae]
Acrodus dolloi, M. Leriche 1911 [Acrodontidae]
Acrodus emmonsi, Leidy 1872 [unclassified species]
Acrodus flemingianus, de Koninck 1863 [Acrodontidae]
Acrodus gaillardoti, Agassiz 1839 [Acrodontidae]
Acrodus georgii, Mutter 1998 [Acrodontidae]
Acrodus gibberulus, Agassiz 1839 [Acrodontidae]
Acrodus hirudo, Agassiz 1839 [Acrodontidae]
Acrodus humilis, Leidy 1872 [unclassified species]
Acrodus illingworthi, Dixon 1850 [Acrodontidae]
Acrodus immarginatus, von Meyer 1849 [Acrodontidae]
Acrodus jaeckeli, Waagen 1895 [Acrodontidae]
Acrodus keuperinus (Murchison and Strickland 1837) [Acrodontidae]
Acrodus larva, Agassiz 1839 [Janassidae]
Acrodus lateralis, Agassiz 1839 [Acrodontidae]
Acrodus latus, Agassiz 1839 [Acrodontidae]
Acrodus leiodus, Woodward 1887 [Lonchidiidae]
Acrodus leiopleurus, Agassiz 1839 [Lonchidiidae]
Acrodus levis, Woodward 1887 [Acrodontidae]
Acrodus minimus, Agassiz 1839 [Lonchidiidae]
Acrodus nitidus, Woodward 1888 [Acrodontidae]
Acrodus nobilis, Agassiz 1838 [Acrodontidae]
Acrodus olsoni, Johnson 1981 [Acrodontidae]
Acrodus oppenheimeri, Stensiö 1921 [Acrodontidae]
Acrodus oreodontus, Wemple 1906 [Acrodontidae]
Acrodus ornatus, Woodward 1889 [Lonchidiidae]
Acrodus paranense, Alessandri 1896 [Acrodontidae]
Acrodus rugosus, Agassiz 1839 [Heterodontidae]
Acrodus scaber, Stensiö 1921 [Acrodontidae]
Acrodus spitzbergensis, Hulke 1873 [Acrodontidae]
Acrodus substriatus (Schmid 1861) [Acrodontidae]
Acrodus sweetlacruzensis, Johnson 1981 [Acrodontidae]
Acrodus undulatus, Agassiz 1839 [Acrodontidae]
Acrodus vermicularis, Stensio 1921 [Acrodontidae]
Acrodus vermiformis, Stensiö 1921 [Acrodontidae]
Acrodus wempliae, Jordan 1907 [Acrodontidae]
Acroechinoidea, Smith 1981 [Echinoidea]
Acroechinoidea, infraclass (Smith 1981) [Echinoidea]
Acroechinoidea, superorder (Smith 1981) [unclassified superorder]
Acrogaster, Agassiz 1839 [Beryciformes]
Acrogaster parvus, Agassiz 1839 [Beryciformes]
Acrogenia [Cystoporata]
Acrognathus, Agassiz 1836 [Scopelidae]
Acrognathus boops, Agassiz 1844 [Scopelidae]
Acrognathus libanicus, Woodward 1901 [Scopelidae]
Acrograptus [Graptoloidea]
Acrohelia, Milne-Edwards and Haime 1857 [Oculinidae]
Acrohyaenodon, Ameghino 1904 [Hyaenodontidae]
Acrohyaenodon acridens, Riggs and Patterson [Borhyaenidae]
Acrohyaenodon acutidens, Rovereto 1914 [unclassified species]
Acrohyaenodon pungens, Ameghino 1904 [Hyaenodontidae]
Acrohybus, raymond 1937 [Trilobita]
Acrokreischeria, Petrunkevitch 1953 [Eophrynidae]
Acrokreischeria verrucosa (Pocock 1911) [Eophrynidae]
Acrolepidae, family, Aldinger 1937 [Palaeonisciformes]
Acrolepis, Agassiz 1843 [Acrolepidae]
Acrolepis addamsi, Broom 1913 [Elonichthyidae]
Acrolepis arctica, Woodward 1912 [Ptycholepididae]
Acrolepis digitata, Woodward 1891 [Acrolepidae]
Acrolepis exsculptus (Kurtze 1839) [Reticulolepis]
Acrolepis hopkinsi, M'Coy 1848 [Acrolepidae]
Acrolepis hortonensis, Dawson 1868 [Acrolepidae]
Acrolepis laetus, Lambe 1916 [Acrolepidae]
Acrolepis lotzi, Gürich 1923 [Acrolepidae]
Acrolepis molyneuxi, Woodward 1903 [Acrolepidae]
Acrolepis ortholepis, Traquair 1884 [Acrolepidae]
Acrolepis sedgwicki (Agassiz 1833) [unclassified species]
Acrolepis sedgwickii, Agassiz 1833 [Acrolepidae]
Acrolepis semigranulosa, Traquair 1890 [Acrolepidae]
Acrolepis wilsoni, Traquair 1888 [Acrolepidae]
Acrolichas, Foerste 1919 [Lichidae]
Acrolichas antiquarius, Bradley 1930 [Lichidae]
Acrolichas aspratilis, Bradley 1930 [Lichidae]
Acrolichas cucullus (Meek and Worthen 1865) [Lichidae]
Acrolichas subdisjunctus, Bradley 1930 [Lichidae]
Acrolophidae, family, Busck 1912 [Tineidae]
Acrolophinae, subfamily (Busck 1912) [unclassified subfamily]
Acrolophus, Poey 1832 [Acrolophidae]
Acroloxidae, family, Thiele 1931 [Gastropoda]
Acroloxoidea, superfamily, Thiele 1931 [Gastropoda]
Acroloxus, Beck 1837 [Acroloxidae]
Acrolusia [Disasteridae]
Acrolusiidae, family, Mintz 1968 [Echinoidea]
Acrometa, Petrunkevitch 1942 [Synotaxidae]
Acrometa clava, Wunderlich 2004 [Synotaxidae]
Acrometa cristata, Petrunkevitch 1942 [Synotaxidae]
Acrometa eichmanni, Wunderlich 2004 [Synotaxidae]
Acrometa incidens, Wunderlich 2004 [Synotaxidae]
Acrometa minutum (Petrunkevitch 1942) [Synotaxidae]
Acrometa pala, Wunderlich 2004 [Synotaxidae]
Acrometa pseudorobusta, Dunlop and Jekel 2009 [Synotaxidae]
Acrometa robusta (Petrunkevitch 1942) [Synotaxidae]
Acrometa samlandica (Petrunkevitch 1942) [Synotaxidae]
Acrometa setosus (Petrunkevitch 1942) [Synotaxidae]
Acrometa succini (Petrunkevitch 1942) [Synotaxidae]
Acromocoris, Bode 1953 [Corixidae]
Acromocoris angustus, Bode 1953 [Corixidae]
Acromocoris similis, Popov 1992 [Corixidae]
Acronemus, Rieppel 1982 [Chondrichthyes]
Acronemus tuberculatus (Bassani 1886) [Chondrichthyes]
Acroneuriinae, subfamily, Klapalek 1914 [Perlidae]
Acroneuriini, tribe, Klapalek 1914 [Perlidae]
Acronotella [Podocopida]
Acronotellidae, family, Swartz 1936 [unclassified family]
Acronychia, Forster and Forster 1775 [Rutaceae]
Acropeltidae, family, Lambert and Thiéry 1914 [Arbacioida]
Acropeltis [Arbaciidae]
Acropentapodiscus, Ellenberger 1970 [unclassified genus]
Acropentapodiscus ginsburgi, Ellenberger 1970 [Ameghinichnidae]
Acropentapodiscus gracilis, Ellenberger 1970 [Ameghinichnidae]
Acropentapodiscus major, Ellenberger 1970 [Ameghinichnidae]
Acropentapodiscus rapidus, Ellenberger 1970 [Acropentapodiscus]
Acropentapodiscus tenuis, Ellenberger 1970 [Acropentapodiscus]
Acropermula, Aristov and Storozhenko 2011 [Paoliidae]
Acropermula acra (Kukalová 1964) [Paoliidae]
Acroperna, Dall [unclassified genus]
Acroperna inflata, Dall 1916 [unclassified species]
Acrophlebia, Cowley 1942 [Heterophlebiidae]
Acrophlebia geinitzi (Handlirsch 1906) [Heterophlebiidae]
Acrophlyctis, Cossmann 1888 [Hydrobiidae]
Acrophoca, Muizon 1981 [Phocidae]
Acrophoca longirostris, Muizon 1981 [Phocidae]
Acropholis, Aldinger 1937 [Acrolepidae]
Acropholis stensioei, Aldinger 1937 [Acrolepidae]
Acrophyllidae, family, Stumm 1949 [Stauriida]
Acrophyllinae, subfamily, Stumm 1949 [Streptelasmatidae]
Acrophyllum, Thomson and Nicholson 1876 [Acrophyllidae]
Acrophyseter, Lambert et al. 2008 [Cetacea]
Acrophyseter deinodon, Lambert et al. 2008 [Cetacea]
Acrophyseter robustus, Lambert et al. 2017 [Cetacea]
Acropiesta, Foerster 1856 [Diapriidae]
Acropiesta janzeni, Buhl 2002 [Diapriidae]
Acropithecus, Ameghino 1904 [Archaeopithecidae]
Acropithecus plenus (Ameghino 1902) [Archaeopithecidae]
Acropithecus rigidus (Ameghino 1901) [Archaeopithecidae]
Acropithecus tersus, Ameghino 1904 [Archaeopithecidae]
Acroplous, Hotton 1959 [Eobrachyopidae]
Acroplous vorax, Hotton 1959 [Eobrachyopidae]
Acropoma, Guenther 1859 [Acropomatidae]
Acropoma lepidotum, Agassiz 1836 [Acropomatidae]
Acropomatidae, family, Gill 1891 [Actinopteri]
Acropora, Oken 1815 [Acroporidae]
Acropora [Porinidae]
Acropora (Isopora), Studer 1878 [Acroporidae]
Acropora abrotanoides (Lamarck 1816) [Acroporidae]
Acropora acuminata (Verrill 1864) [Acroporidae]
Acropora alvarezi, Wallace 2008 [Acroporidae]
Acropora anglica (Duncan 1866) [Acroporidae]
Acropora aspera (Dana 1846) [Acroporidae]
Acropora austera (Dana 1846) [Acroporidae]
Acropora bancellsae, Alvarez-Perez 1997 [Acroporidae]
Acropora bartonensis, Wallace 2008 [Acroporidae]
Acropora bonellii (Sismonda 1871) [Acroporidae]
Acropora borneoensis (Felix 1921) [Acroporidae]
Acropora branchi, Riegl 1995 [Acroporidae]
Acropora britannica, Wallace 2008 [Acroporidae]
Acropora brueggemanni (Brook 1893) [Acroporidae]
Acropora cerealis (Dana 1846) [Acroporidae]
Acropora cervicornis (Lamarck 1816) [Acroporidae]
Acropora clathrata (Brook 1891) [Acroporidae]
Acropora corymbosa (Lamarck 1816) [Acroporidae]
Acropora crateriformis (Gardiner 1898) [Acroporidae]
Acropora cuneata (Dana 1846) [Acroporidae]
Acropora cylindrica, Veron 2000 [Acroporidae]
Acropora cytherea (Dana 1846) [Acroporidae]
Acropora danai (Milne-Edwards and Haime 1860) [Acroporidae]
Acropora darrellae, Santodomingo 2014 [Acroporidae]
Acropora deformis (Michelin 1840) [Acroporidae]
Acropora derawanensis, Wallace 1997 [Acroporidae]
Acropora digitifera (Dana 1846) [Acroporidae]
Acropora dispar, Nemenzo 1967 [Acroporidae]
Acropora dissimilis, Verrill 1902 [Acroporidae]
Acropora divaricata (Dana 1846) [Acroporidae]
Acropora donei, Veron and Wallace 1984 [Acroporidae]
Acropora duncani (Reuss 1867) [Acroporidae]
Acropora eibli, Pillai and Scheer 1973 [Acroporidae]
Acropora elegans (Milne Edwards 1860) [Acroporidae]
Acropora elenae, Santodomingo 2014 [Acroporidae]
Acropora elizabethensis, Veron 2000 [Acroporidae]
Acropora emanuelae, Santodomingo 2014 [Acroporidae]
Acropora eminens, Marenzeller 1906 [Acroporidae]
Acropora exarata (Michelotti 1838) [Acroporidae]
Acropora fastigata, Nememzo 1967 [unclassified species]
Acropora fennemai (Gerth 1921) [Acroporidae]
Acropora filiformis, Veron 2000 [Acroporidae]
Acropora florida (Dana 1846) [Acroporidae]
Acropora formosa (Dana 1846) [Acroporidae]
Acropora gemmifera (Brook 1892) [Acroporidae]
Acropora glauca (Brook 1893) [Acroporidae]
Acropora globiceps (Dana 1846) [Acroporidae]
Acropora grandis (Brook 1892) [Acroporidae]
Acropora haidingeri (Reuss 1864) [Acroporidae]
Acropora haimei (Milne-Edwards and Haime 1860) [Acroporidae]
Acropora halmaherae, Wallace and Wolstenholme 1998 [Acroporidae]
Acropora hasibuani, Santodomingo 2014 [Acroporidae]
Acropora hebes (Dana 1846) [Acroporidae]
Acropora hemprichii (Ehrenberg 1834) [Acroporidae]
Acropora hispida (Brook 1891) [Acroporidae]
Acropora hoeksemai, Wallace 1997 [Acroporidae]
Acropora horrida (Dana 1846) [Acroporidae]
Acropora humilis (Dana 1846) [Acroporidae]
Acropora hyacinthus (Dana 1846) [Acroporidae]
Acropora indiana, Wallace 1994 [Acroporidae]
Acropora indonesia, Wallace 1997 [Acroporidae]
Acropora intermedia (Brook 1891) [Acroporidae]
Acropora irregularis (Brook 1892) [Acroporidae]
Acropora kirstyae, Veron and Wallace 1984 [Acroporidae]
Acropora kosurini, Wallace 1994 [Acroporidae]
Acropora lamarcki, Veron 2000 [Acroporidae]
Acropora latistella (Brook 1892) [Acroporidae]
Acropora lavandulina (Michelin 1840) [Acroporidae]
Acropora listeri (Brook 1893) [Acroporidae]
Acropora longicyathus (Milne-Edwards and Haime 1860) [Acroporidae]
Acropora lovelli, Veron and Wallace 1984 [Acroporidae]
Acropora lutkeni, Crossland 1952 [Acroporidae]
Acropora magnifica, Nemenzo 1971 [Acroporidae]
Acropora mangarevensis, Vaughan 1906 [Acroporidae]
Acropora massawensis, Marenzeller 1906 [Acroporidae]
Acropora microphthalma (Verrill 1869) [Acroporidae]
Acropora millepora (Ehrenberg 1834) [Acroporidae]
Acropora minuta, Veron 2000 [Acroporidae]
Acropora monticulosa (Brüggemann 1879) [Acroporidae]
Acropora multiramosa, Nemenzo 1967 [Acroporidae]
Acropora muricata (Linnaeus 1758) [Acroporidae]
Acropora nasuta (Dana 1846) [Acroporidae]
Acropora natalensis, Riegl 1995 [Acroporidae]
Acropora nobilis (Dana 1846) [Acroporidae]
Acropora orbicularis (Brook 1892) [Acroporidae]
Acropora ornata (Defrance 1828) [Acroporidae]
Acropora pachymorpha, Chevalier 1956 [Acroporidae]
Acropora palifera (Lamarck 1816) [Acroporidae]
Acropora palmata (Lamarck 1816) [Acroporidae]
Acropora palmerae, Wells 1954 [Acroporidae]
Acropora panamensis, Vaughan 1919 [Acroporidae]
Acropora papillare, Latypov 1992 [Acroporidae]
Acropora pharaonis (Milne-Edwards and Haime 1860) [Acroporidae]
Acropora pichoni, Wallace 1999 [Acroporidae]
Acropora piedmontensis, Wallace and Bosellini 2014 [Acroporidae]
Acropora pinguis, Wells 1950 [Acroporidae]
Acropora plicata (Brook 1891) [Acroporidae]
Acropora polystoma (Brook 1891) [Acroporidae]
Acropora proteacea, Wallace 2008 [Acroporidae]
Acropora pseudolavandulina, Chevalier 1956 [Acroporidae]
Acropora pulchra (Brook 1891) [Acroporidae]
Acropora ramosi, Alvarez et al. 1989 [Acroporidae]
Acropora renemai, Santodomingo 2014 [Acroporidae]
Acropora robusta (Dana 1846) [Acroporidae]
Acropora roemeri (Duncan 1866) [Acroporidae]
Acropora roseni, Wallace 1999 [Acroporidae]
Acropora rudis (Rehberg 1892) [Acroporidae]
Acropora russelli, Wallace 1994 [Acroporidae]
Acropora saludensis, Vaughan 1919 [Acroporidae]
Acropora salundensis, Vaughan 1919 [Acroporidae]
Acropora samoensis (Brook 1891) [Acroporidae]
Acropora scherzeriana (Brüggemann 1877) [Acroporidae]
Acropora schmitti, Wells 1950 [Acroporidae]
Acropora secale (Studer 1878) [Acroporidae]
Acropora sekiseiensis, Veron 1990 [Acroporidae]
Acropora selago (Studer 1878) [Acroporidae]
Acropora slovenica, Wallace and Bosellini 2014 [Acroporidae]
Acropora smithi (Brook 1893) [Acroporidae]
Acropora solanderi (Defrance 1828) [Acroporidae]
Acropora solitaryensis, Veron and Wallace 1984 [Acroporidae]
Acropora spicifera (Dana 1846) [Acroporidae]
Acropora splendida, Nemenzo 1967 [Acroporidae]
Acropora squarrosa (Ehrenberg 1834) [Acroporidae]
Acropora stoddarti, Pillai and Scheer 1976 [Acroporidae]
Acropora surculosa (Dana 1846) [Acroporidae]
Acropora tampaensis, Weisbord 1973 [Acroporidae]
Acropora tenella (Brook 1892) [Acroporidae]
Acropora tenuis (Dana 1846) [Acroporidae]
Acropora teres (Verrill 1866) [Acroporidae]
Acropora tergestina, Oppenheim 1901 [Acroporidae]
Acropora togianensis, Wallace 1997 [Acroporidae]
Acropora tortuosa (Dana 1846) [Acroporidae]
Acropora tumida (Verrill 1866) [Acroporidae]
Acropora tutuilensis, Hoffmeister 1925 [Acroporidae]
Acropora valenciennesi (Milne-Edwards and Haime 1860) [Acroporidae]
Acropora valida (Dana 1846) [Acroporidae]
Acropora variabilis (Klunzinger 1879) [Acroporidae]
Acropora variolosa (Klunzinger 1879) [Acroporidae]
Acropora vaughani, Wells 1954 [Acroporidae]
Acropora wallaceae, Veron 1990 [Acroporidae]
Acropora wilsonae, Wallace 2008 [Acroporidae]
Acropora yongei, Veron and Wallace 1984 [Acroporidae]
Acroporella, Praturlon 1964 [Triploporellaceae]
Acroporella radoicici, Praturlon 1964 [unclassified species]
Acroporidae, family, Verrill 1902 [Scleractinia]
Acroprivesa, Schmidt 1912 [Ricanides]
Acroprivesa msandarusi, Stroinski and Szwedo 2002 [Ricanides]
Acropsammia, Gerth 1933 [Helioporidae]
Acropyga, Roger 1862 [Formicidae]
Acropyga glaesaria, LaPolla 2005 [Formicidae]
Acropyge, Qian 1977 [Phillipsiidae]
Acropyge brevica, Yin 1978 [Phillipsiidae]
Acropyge encrinuroides (Weber 1944) [Phillipsiidae]
Acropyge lanceolata, Kobayashi and Hamada 1978 [Phillipsiidae]
Acropyge multisegmenta, Qian 1977 [Phillipsiidae]
Acropyge weggeni, Hahn and Hahn 1981 [Phillipsiidae]
Acropyramididae, family, Haeckel 1881 [Nassellaria]
Acropyramis, Haeckel 1881 [Acropyramididae]
Acroreia, Cossmann 1885 [Acroreiidae]
Acroreiidae, family, Cossmann 1893 [Gastropoda]
Acrorhabdus, Stensiö 1921 [Palaeoniscidae]
Acrorhabdus asplundi, Stensiö 1921 [Palaeoniscidae]
Acrorhabdus bertili, Stensiö 1921 [Palaeoniscidae]
Acrorhabdus latistriatus, Stensiö 1921 [Palaeoniscidae]
Acrorhizodus, Cappetta et al. 2006 [Hybodontiformes]
Acrorhizodus khoratensis, Cappetta et al. 2006 [Hybodontiformes]
Acrosaccus, Willard 1928 [Disciniidae]
Acrosaccus shuleri, Willard 1928 [Disciniidae]
Acrosaccus squamosus (Barrande 1879) [Disciniidae]
Acrosalenia, Agassiz 1840 [Acrosaleniidae]
Acrosalenia chartroni, Lambert 1904 [unclassified species]
Acrosalenia hemicidaroides, Wright 1851 [unclassified species]
Acrosalenia lycetti, Wright 1851 [unclassified species]
Acrosalenia spinosa, Agassiz 1847 [unclassified species]
Acrosaleniidae, family, Gregory 1900 [Salenioida]
Acrosalenioida, order, Vadet 1999 [Echinoidea]
Acrosaster [Arbaciidae]
Acrosauria, order, Meyer [unclassified order]
Acrosauridae, family, Meyer 1861 [unclassified family]
Acrosaurus, Meyer 1854 [unclassified genus]
Acrosaurus frischmanni, Meyer 1854 [unclassified species]
Acrosmilia, d'Orbigny 1849 [Acrosmiliidae]
Acrosmilia agassizi (Vaughan 1899) [Acrosmiliidae]
Acrosmilia baltica (Hennig 1900) [Acrosmiliidae]
Acrosmilia baumbergeri (Kopy 1898) [unclassified species]
Acrosmilia clavata (Reuss 1854) [Acrosmiliidae]
Acrosmilia conica, d'Orbigny 1850 [Acrosmiliidae]
Acrosmilia conica (Koby 1886) [Acrosmiliidae]
Acrosmilia cupulata (Koby 1886) [Acrosmiliidae]
Acrosmilia depressa (Etallon 1858) [Acrosmiliidae]
Acrosmilia dilatata (Reuss 1868) [Acrosmiliidae]
Acrosmilia dubravitzensis (Oppenheim 1901) [Acrosmiliidae]
Acrosmilia elongata (Reuss 1854) [Acrosmiliidae]
Acrosmilia flouesti (de Fromentel and Ferry 1867) [Acrosmiliidae]
Acrosmilia fungina (Solomko 1888) [Acrosmiliidae]
Acrosmilia gregoryi (Koby 1905) [Latomeandridae]
Acrosmilia minima, Beauvais and M'Rabet 1977 [Acrosmiliidae]
Acrosmilia patellata (Michelin 1845) [Latomeandridae]
Acrosmilia pironai (d'Achiardi 1875) [Acrosmiliidae]
Acrosmilia precursor, E. Jaworsky 1915 [Acrosmiliidae]
Acrosmilia robusta, Geyer 1954 [Acrosmiliidae]
Acrosmilia sanchezroigi (Wells 1941) [Acrosmiliidae]
Acrosmilia separata (Eliasova 2004) [Acrosmiliidae]
Acrosmilia soemmanni (de Fromentel 1861) [Acrosmiliidae]
Acrosmilia thrumanni (Koby 1886) [Acrosmiliidae]
Acrosmilia thurmanni (Koby 1886) [Acrosmiliidae]
Acrosmilia zitteli (Reis 1889) [Acrosmiliidae]
Acrosmiliidae, family, Alloiteau 1952 [Scleractinia]
Acrosmiliopsis [unclassified genus]
Acrosmiliopsis marini (Bataller 1936) [Dermosmiliidae]
Acrosolarium, Koken 1896 [Cirridae]
Acrosphaera, Haeckel 1881 [Collosphaeridae]
Acrosphaerorthoceras [Orthocerida]
Acrospira, Batten 1985 [Murchisoniina]
Acrospira cristata, Batten 1985 [Murchisoniina]
Acrospirifer, Wedekind 1926 [Acrospiriferidae]
Acrospirifer kobehana (Merriam 1940) [Hysterolitidae]
Acrospirifer murchisoni (Castelneau 1843) [Acrospiriferidae]
Acrospirifer pinyonensis (Meek 1870) [Adolfiidae]
Acrospiriferidae, family, Termier and Termier 1949 [Spiriferida]
Acrospiriferinae, subfamily, Termier and Termier 1949 [Acrospiriferidae]
Acrospyris, Haeckel 1881 [Triospyrididae]
Acrosquama, Qian and Xiao 1984 [Halkieriidae]
Acrosquama glossoides, Gao et al. 1985 [Halkieriidae]
Acrosquama liratus, Gao et al. 1985 [Halkieriidae]
Acrosquama mira, Qian and Xiao 1984 [Halkieriidae]
Acrossula [Ostracoda]
Acrossus, Mulsant 1842 [unclassified genus]
Acrostemma, Cossmann 1889 [Cylichnidae]
Acrosterigma, Dall 1900 [Cardiidae]
Acrosterigma (Vasticardium) (Iredale 1927) [Cardiidae]
Acrosterigma (Vasticardium) arenicola (Reeve 1845) [Cardiidae]
Acrosterigma cygnorum, Deshayes 1855 [Cardiidae]
Acrosterigma linguatigris (Maury 1917) [Cardiidae]
Acrosterigma reeveanum, Dunker 1852 [Cardiidae]
Acrosterigma unicolor, Sowerby 1834 [Cardiidae]
Acrostichaceae, family [unclassified family]
Acrostichides, Fontaine 1883 [unclassified genus]
Acrostichides linnaefolium, Bunbury 1883 [unclassified species]
Acrostichites, Goeppert 1836 [unclassified genus]
Acrostichites williamsonis (Brongniart 1834) [unclassified species]
Acrostichophyllum, Velenovsky 1889 [unclassified genus]
Acrostichophyllum cretaceum, Velenovsky 1889 [unclassified species]
Acrostichopteris, Fontaine 1889 [Filicales]
Acrostichopteris longipennis, Fontaine 1889 [Filicales]
Acrostichum, Linnaeus [Pteridophyta]
Acrostichum lanzaeanum (Visiani 1858) [unclassified species]
Acrostichum palaeocenicum, Fritel 1910 [Acrostichum]
Acrostigma (Emery 1891) [Formicidae]
Acrostylops, Ameghino 1901 [Notostylopidae]
Acrostylops pungiunculus, Ameghino 1901 [Notostylopidae]
Acrostylus, Cossmann 1896 [Heterostrophia]
Acrotemnus, Agassiz 1843 [Pycnodontidae]
Acrotemnus faba, Agassiz 1844 [Pycnodontidae]
Acrotetidae, family, Schuchert [Acrotretida]
Acroteuthis, Stolley 1911 [Belemnitidae]
Acrothele, Linnarsson 1876 [Acrothelidae]
Acrothele (Redlichella), Walcott 1908 [unclassified subgenus]
Acrothele (Redlichella) granulata (Linnarsson 1876) [unclassified species]
Acrothele affinis, Resser 1939 [Acrothelidae]
Acrothele concava, Cooper et al. 1952 [unclassified species]
Acrothele coriacea, Linnarsson 1876 [unclassified species]
Acrothele granulata, Linnarsson 1876 [unclassified species]
Acrothele medioradiata, Reed 1917 [Disciniidae]
Acrothele primaeva (de Verneuil and Barrande 1860) [Acrothelidae]
Acrothele sougyi, Poulsen 1960 [unclassified species]
Acrothele speciosa, Resser 1938 [Acrothelidae]
Acrothele spinulosa, Poulsen 1960 [unclassified species]
Acrothele spurri, Walcott 1908 [Acrothelidae]
Acrothelidae, family, Schuchert 1893 [Lingulida]
Acrothelinae, subfamily, Walcott and Schuchert 1908 [Acrothelidae]
Acrotheloidea, superfamily, Walcott 1908 [Lingulida]
Acrotheria, subclass, Averianov and Lopatin 2011 [Mammalia]
Acrotherium, Ameghino 1887 [Toxodontidae]
Acrotherium intermedium, Mercerat 1891 [unclassified species]
Acrotherium karaikense, Ameghino 1890 [Toxodontidae]
Acrotherium kobyi, Mercerat 1891 [Toxodontidae]
Acrotherium mutabile, Mercerat 1891 [Toxodontidae]
Acrotherium patagonicum, Mercerat 1891 [Toxodontidae]
Acrotherium rusticum, Ameghino 1887 [Toxodontidae]
Acrotherium stygium, Ameghino 1887 [Toxodontidae]
Acrotherium variegatum, Mercerat 1891 [Toxodontidae]
Acrotholus, Evans et al. 2013 [Pachycephalosauridae]
Acrotholus audeti, Evans et al. 2013 [Pachycephalosauridae]
Acrothoracica, superorder, Gruvel 1905 [Cirripedia]
Acrothyra, Mathew 1901 [Acrotretidae]
Acrothyra bonnia, Skovsted et al. 2017 [unclassified species]
Acrothyra proavia (Matthew 1899) [Acrotretidae]
Acrothyra sera, Mathew 1902 [Acrotretidae]
Acrothyris [Stringocephalidae]
Acrotidae, family [Percomorphi]
Acrotitan, Ye 1983 [Brontotheriidae]
Acrotitan ulanshirehensis, Ye 1983 [Brontotheriidae]
Acrotreta, Kutorga 1848 [Acrotretidae]
Acrotreta curvata, Walcott 1902 [unclassified species]
Acrotreta declivis (Willard 1928) [Acrotretidae]
Acrotreta definita, Walcott 1902 [Acrotretidae]
Acrotreta levata, Resser 1939 [Acrotretidae]
Acrotreta nana, Hadding 1913 [Acrotretidae]
Acrotreta nitens, Resser 1938 [Acrotretidae]
Acrotreta ophirensis, Walcott 1902 [Acrotretidae]
Acrotreta primaaea (Walcott 1902) [Acrotretidae]
Acrotreta primaea, Walcott 1902 [unclassified species]
Acrotreta proavia, Matthew 1899 [Acrotretidae]
Acrotreta recurva, Kutorga 1848 [unclassified species]
Acrotreta schucherti, Lochman 1938 [unclassified species]
Acrotreta socialis, Seebach 1865 [unclassified species]
Acrotreta spinosa, Walcott 1905 [unclassified species]
Acrotreta subconica, Kutorga 1848 [unclassified species]
Acrotreta taconica (Walcott 1885) [Acrotretidae]
Acrotreta tanneri, Metzger 1922 [unclassified species]
Acrotretacea, superfamily, Schuchert 1893 [Acrotretida]
Acrotretella, Ireland 1961 [Torynelasmatidae]
Acrotretella siluriana, Ireland 1961 [unclassified species]
Acrotretida, order, Kuhn 1949 [Lingulata]
Acrotretidae, family, Schuchert 1893 [Acrotretida]
Acrotretidina, suborder, Kuhn 1949 [Acrotretida]
Acrotretinae, subfamily, Schuchert 1893 [Acrotretidae]
Acrotretoidea, superfamily, Schuchert 1893 [Acrotretida]
Acrotrichinae, subfamily, Reitter 1909 [Ptilina]
Acrotrichini, tribe (Reitter 1909) [unclassified tribe]
Acrotrichis, Moltschulsky 1848 [Ptilina]
Acrotypotherium, Rusconi 1936 [unclassified genus]
Acroura, Agassiz 1836 [Ophiurida]
Acroura agassiz, von Münster 1839 [Ophiolepididae]
Acroura agassizi (von Münster 1839) [Ophiolepididae]
Acroura armata, Picard 1886 [Aplocomidae]
Acroura brodiei, Wright 1866 [Aplocomidae]
Acroura cornueliana, d'Orbigny 1850 [Ophiurida]
Acroura coronaeformis (Picard 1858) [Aplocomidae]
Acroura cottaldina, d'Orbigny 1850 [Ophiurida]
Acroura granulata (Benecke 1868) [Ophiolepididae]
Acroura mediojurensis, Thurmann 1851 [Ophiurida]
Acroura pellioperta, Picard 1889 [Aplocomidae]
Acroura prisca (Goldfuss 1833) [Ophiolepididae]
Acroura serrata (Roemer 1841) [Ophiuridae]
Acroura squamosa (Picard 1858) [Aplocomidae]
Acroura subnuda, d'Orbigny 1850 [Ophiurida]
Acrovena, Hickey 1977 [Melastomataceae]
Acrovena laevis, Hickey 1977 [Melastomataceae]
Acrtodontomys, Gunnell 1985 [unclassified genus]
Acrulia, Thomson 1858 [Staphylinidae]
Acrulia tumidula (Maklin 1853) [Staphylinidae]
Acruliammina, Loeblich and Tappan 1946 [Haplophragmoiidae]
Acrulocercus, Cabanis 1847 [unclassified genus]
Acrulocercus bishopi, Rothschild 1893 [Meliphagidae]
Acrura coronaiformis (Picard 1858) [Aplocomidae]
Acrybia, H. Adams and A. Adams 1853 [Naticidae]
Acrydiana, family, Latreille 1802 [Orthoptera]
Acrydium, Geoffroy 1762 [Tetrigidae]
Acrydium bachofeni, Zeuner 1937 [Tetrigidae]
Acrydium barthelemyi, Hope 1848 [Acrididae]
Acrydium latreillei, Perty 1832 [Acrididae]
Acryllium, Gray 1840 [Phasianidae]
Acryllium vulturinum, Hardwicke 1834 [unclassified species]
Acsaspedites [Trachylinida]
Acsmithia, R. D. Hoogland 1979 [Cunoniaceae]
Acsmithia grandiflora, Carpenter and Buchanan 1993 [Cunoniaceae]
Actaea, De Haan 1833 [Xanthidae]
Actaea acantha (H. Milne-Edwards 1834) [Xanthidae]
Actaea bifrons, Rathbun 1898 [Xanthidae]
Actaea calzadai, Muller 1984 [Xanthidae]
Actaea cretacea, Rathbun 1935 [Xanthidae]
Actaea nodosa, Stimpson 1860 [Xanthidae]
Actaea persica, A. Milne-Edwards 1865 [Xanthidae]
Actaea polyacantha, Heller 1861 [Xanthidae]
Actaea pura, Stimpson 1859 [Xanthidae]
Actaea rufopunctata, Milne-Edwards 1834 [Xanthidae]
Actaea rufopunctata nodosa (Stimpson 1860) [Xanthidae]
Actaea semblatae, Guinot 1976 [Xanthidae]
Actaea tropicana, Hu and Tao 1996 [Xanthidae]
Actaea turocampestris, Muller 1984 [Xanthidae]
Actaeinae, subfamily, Alcock 1898 [Xanthidae]
Actaeites, Muller and Collins 1991 [Decapoda]
Actaeites lobatus, Muller and Collins 1991 [Decapoda]
Actaeodes, Dana 1851 [Xanthidae]
Actaeodes hirsutissima, Ruppell 1830 [Xanthidae]
Actaeodes tomentosus, H. Milne-Edwards 1834 [Xanthidae]
Actaeon, Oken 1815 [Acteonidae]
Actaeon (Microglyphis) (Unknown) [unclassified subgenus]
Actaeon (Microglyphis) breviculus, Dall 1902 [unclassified species]
Actaeon (Microglyphis) schencki, Berry 1941 [unclassified species]
Actaeon (Microglyphus), Unknown [unclassified subgenus]
Actaeon (Rictaxis) (Dall 1871) [Acteonidae]
Actaeon (Rictaxis) fusulus, Dall 1896 [Acteonidae]
Actaeon andersoni, Conrad 1848 [unclassified species]
Actaeon annectens, Meyer 1885 [Acteonidae]
Actaeon argentinus, Ihering 1907 [Acteonidae]
Actaeon calvertensis, Martin 1904 [Acteonidae]
Actaeon chipolanus, Dall 1896 [Acteonidae]
Actaeon costaricensis, Olsson 1922 [Acteonidae]
Actaeon elongatus, Sowerby 1824 [Acteonidae]
Actaeon fusulus (Dall 1896) [Acteonidae]
Actaeon hamadryados, Maury 1910 [Acteonidae]
Actaeon idoneus, Conrad 1833 [Acteonidae]
Actaeon impressus, Gabb 1864 [unclassified species]
Actaeon lawsoni, Weaver 1905 [unclassified species]
Actaeon lenzi, Choffat 1888 [unclassified species]
Actaeon luculi, Maury 1910 [Acteonidae]
Actaeon merriami, Waring 1917 [unclassified species]
Actaeon moodyi, Dickerson 1916 [unclassified species]
Actaeon ovoides, Conrad 1830 [Acteonidae]
Actaeon punctostriatus, Dall 1890 [Acteonidae]
Actaeon pusilla (Forbes 1843) [Acteonidae]
Actaeon pusillus, Ravn 1939 [Acteonidae]
Actaeon reussi, Martin 1879 [Acteonidae]
Actaeon riomaensis, Maury 1917 [Acteonidae]
Actaeon shilohensis, Whitfield 1894 [Acteonidae]
Actaeon subulatus, S. Wood 1842 [Acteonidae]
Actaeon textilis (Guppy 1873) [Acteonidae]
Actaeonella (d'Orbigny 1843) [Acteonellidae]
Actaeonella borneensis, Sohl and Kollmann 1985 [Acteonellidae]
Actaeonella briggsi, Sohl and Kollmann 1985 [Acteonellidae]
Actaeonella browni, Sohl and Kollmann 1985 [Acteonellidae]
Actaeonella cincta, Winckler 1861 [unclassified species]
Actaeonella coquiensis, Sohl and Kollmann 1985 [Acteonellidae]
Actaeonella cubensis, Sohl and Kollmann 1985 [Acteonellidae]
Actaeonella delgadoi, P. Choffat 1901 [Acteonellidae]
Actaeonella jicarensis, Sohl and Kollmann 1985 [Acteonellidae]
Actaeonella lucianoi, Maury 1930 [Acteonellidae]
Actaeonella marchmontensis, Sohl and Kollmann 1985 [Acteonellidae]
Actaeonella matensis, Fittipaldi 1900 [Acteonidae]
Actaeonella oviformis, Gabb 1868 [Acteonellidae]
Actaeonella pecosensis, T. W. Stanton 1947 [Acteonellidae]
Actaeonella pompei, Maury 1930 [Acteonellidae]
Actaeonella robinsoni, Sohl and Kollmann 1985 [Acteonellidae]
Actaeonella silvai, Maury 1925 [Acteonellidae]
Actaeonella tamandarensis, Maury 1930 [Acteonellidae]
Actaeonellidae, family, Gill 1871 [Architectibranchia]
Actaeonellina, Pchelintsev 1963 [Cephalaspida]
Actaeonema, Conrad 1865 [Turritellidae]
Actaeonidae, family (d'Orbigny 1835) [Architectibranchia]
Actaeonidea, Gabb 1872 [Cephalaspida]
Actaeonidea oryza, Gabb 1872 [Acteonidae]
Actaeonina (A.D. d'Orbigny 1850) [Acteoninidae]
Actaeonina (Crenilabium) (Cossmann 1889) [unclassified subgenus]
Actaeonina (Crenilabium) elata (von Koenen 1885) [unclassified species]
Actaeonina (Ovactaeonina) (Cossmann 1895) [Acteoninidae]
Actaeonina abdominiformis, Schröder 1995 [Acteoninidae]
Actaeonina aequalis, Terquem and Jourdy 1871 [Cylindrobullinidae]
Actaeonina andina (Haas 1953) [Acteoninidae]
Actaeonina armata, Stoppani 1857 [Purpurinidae]
Actaeonina brevis, Böhm 1895 [Acteoninidae]
Actaeonina concavata, Grundel 1999 [Acteoninidae]
Actaeonina cylindrata (Haas 1953) [Acteoninidae]
Actaeonina domeria, Gründel and Nützel 1998 [Acteoninidae]
Actaeonina elata, von Koenen 1885 [unclassified species]
Actaeonina esinensis, Stoppani 1858 [Purpurinidae]
Actaeonina fusoides, Stoppani 1857 [Purpurinidae]
Actaeonina gracilis, Assmann 1924 [Acteoninidae]
Actaeonina malzi, Schröder 1995 [Acteoninidae]
Actaeonina minuta (Stevens 1858) [Meekospiridae]
Actaeonina moorei (Nützel and Kiessling 1997) [Acteoninidae]
Actaeonina obliquata, Gründel and Nützel 1998 [Acteoninidae]
Actaeonina peruviana (Haas 1953) [Acteoninidae]
Actaeonina pseudmoorei, Gründel and Buchholz 1999 [Cylindrobullinidae]
Actaeonina pupoides (Gabb 1864) [unclassified species]
Actaeonina rara, Gründel and Nützel 1998 [Acteoninidae]
Actaeonina scalaris (Münster 1841) [Acteoninidae]
Actaeonina striata, Lissajous 1923 [Bullinidae]
Actaeonina submoorei (Nützel and Kiessling 1997) [Acteoninidae]
Actaeonina subscalaris, Laube 1868 [Acteoninidae]
Actaeoninidae, family, V.F. Pchelincev and I.A. Korobkov 1960 [Gastropoda]
Actaeonoidea, superfamily (d'Orbigny 1835) [Architectibranchia]
Actaeops, Portell and Collins 2004 [Xanthidae]
Actaeops frontalis, Portell and Collins 2004 [Xanthidae]
Actaeopsis, Carter 1898 [Decapoda]
Actaeopsis wiltshirei, Carter 1898 [Decapoda]
Actaeopyramis, P. Fischer 1885 [Cimidae]
Actaeopyramis marcusseni, Schnetler 2001 [Cimidae]
Actaeus [Arthropoda]
Actea, Germar 1842 [Coptoclavidae]
Actea dubia, Meunier 1895 [Blattodea]
Actea sphinx, Münster 1842 [Coptoclavidae]
Actenobius, Fall 1905 [Ptinidae]
Actenobius magneoculus, Peris et al. 2015 [Ptinidae]
Actenomys, Burmeister 1888 [Ctenomyidae]
Actenomys priscus, Owen 1840 [Ctenomyidae]
Acteocina, Gray 1847 [Cylichnidae]
Acteocina (Cylichnella) (Gabb 1873) [Cylichnidae]
Acteocina (Cylichnella) ovumlacerti (Guppy 1874) [Cylichnidae]
Acteocina (Cylichnella) triticumtritonis, Maury 1917 [Cylichnidae]
Acteocina anetaspira, Woodring 1928 [Cylichnidae]
Acteocina bidentata (d'Orbigny 1841) [Cylichnidae]
Acteocina bullata (Kiener 1834) [Cylichnidae]
Acteocina bullata costaricana, Olsson 1922 [Cylichnidae]
Acteocina canaliculata (Say 1826) [Cylichnidae]
Acteocina candei (d'Orbigny 1841) [Cylichnidae]
Acteocina cederstromi, Richards 1947 [Cylichnidae]
Acteocina chehalisensis, Weaver 1916 [Acteonidae]
Acteocina chowanensis, Richards 1947 [Cylichnidae]
Acteocina culcitella (Gould 1853) [unclassified species]
Acteocina harpa (Dall 1871) [unclassified species]
Acteocina kirkwoodiana, Richards and Harbison 1944 [Cylichnidae]
Acteocina lajonkaireana (Basterot 1825) [unclassified species]
Acteocina lepta, Woodring 1928 [Cylichnidae]
Acteocina pedroensis, Oldroyd 1925 [unclassified species]
Acteocina puruha, Pilsbry and Olsson 1941 [Cylichnidae]
Acteocina recta (d'Orbigny 1845) [Cylichnidae]
Acteocina sandwicensis, Pease 1860 [unclassified species]
Acteocina subbullata, Pilsbry and Johnson 1917 [Cylichnidae]
Acteocinidae, family [Acteonidae]
Acteon, Montfort 1810 [Acteonidae]
Acteon (Acteon), Montfort 1810 [Acteonidae]
Acteon (Acteon) microspiralis, Oleinik 1991 [Acteonidae]
Acteon (Acteon) punctostriatus (C.B. Adams 1840) [Acteonidae]
Acteon (Rictaxis) (Dall 1871) [unclassified subgenus]
Acteon (Rictaxis) punctocoelatus (Carpenter 1864) [unclassified species]
Acteon (Rictaxis) weaveri, Addicott 1970 [unclassified species]
Acteon acutus, Sowerby 1824 [Cylindrobullinidae]
Acteon annectens (Meyer 1885) [Acteonidae]
Acteon arnumensis, Sorgenfrei 1958 [Acteonidae]
Acteon bajoensis, Chiesa et al. 1995 [Acteonidae]
Acteon boulderana, Etherington 1931 [unclassified species]
Acteon boulderanus (Etherington 1931) [unclassified species]
Acteon chattonensis, Marwick 1929 [Acteonidae]
Acteon chehalisensis (Weaver 1916) [Acteonidae]
Acteon chipolanus (Dall 1896) [Acteonidae]
Acteon cicatricosus, N. F. Sohl 1964 [Acteonidae]
Acteon costaricensis (Olsson 1922) [Acteonidae]
Acteon cubensis, Gabb 1873 [Acteonidae]
Acteon cuspidatus, Sowerby 1824 [Cylindrobullinidae]
Acteon eurystoma, Woodring 1928 [Acteonidae]
Acteon fusulus (Dall 1896) [Acteonidae]
Acteon ghossi, Dey 1961 [Acteonidae]
Acteon granulatus, Lea 1833 [unclassified species]
Acteon hamadryados (Maury 1910) [Acteonidae]
Acteon idoneus (Conrad 1833) [Acteonidae]
Acteon impressus, Gabb 1864 [unclassified species]
Acteon korphys, Gardner 1947 [Acteonidae]
Acteon korphys, Gardner 1947 [Acteonidae]
Acteon linteus, Conrad 1858 [Acteoninidae]
Acteon luculi (Maury 1910) [Acteonidae]
Acteon melanoides, Conrad 1830 [Pyramidellidae]
Acteon moodyi (Dickerson 1916) [unclassified species]
Acteon ovoides (Conrad 1830) [Acteonidae]
Acteon parvum, Dickerson 1917 [unclassified species]
Acteon pistilliformis, N. F. Sohl 1964 [Acteonidae]
Acteon politus (Gabb 1868) [unclassified species]
Acteon punctocaelatus (Carpenter 1864) [unclassified species]
Acteon punctostriata (C.B. Adams 1840) [Acteonidae]
Acteon punctostriatus (C.B. Adams 1840) [Acteonidae]
Acteon pygmaea, Grateloup 1838 [unclassified species]
Acteon rakhiensis, Eames 1952 [Acteonidae]
Acteon riomaensis (Maury 1917) [Acteonidae]
Acteon semilaevis, Ortmann 1900 [Acteonidae]
Acteon simiensis, Nelson 1925 [unclassified species]
Acteon simplex, Lea 1843 [Pyramidellidae]
Acteon staszyci, Zeuschner 1849 [Endoplocus]
Acteon subulatus (S. Wood 1842) [Acteonidae]
Acteon sullivanae, Murphy and Rodda 1960 [unclassified species]
Acteon susanaensis, Nelson 1925 [unclassified species]
Acteon teramachii, Habe 1950 [Acteonidae]
Acteon textilis (Guppy 1873) [Acteonidae]
Acteon tornatilis (Linnaeus 1758) [Acteonidae]
Acteon turbinatus, Lea 1843 [Pyramidellidae]
Acteon umpquaensis, Turner 1938 [unclassified species]
Acteon vacavillensis, Palmer 1923 [Acteonidae]
Acteon venturensis, Nelson 1925 [unclassified species]
Acteon virgatus, Reeve 1835 [Acteonidae]
Acteonacea, superfamily, d'Orbigny 1835 [Architectibranchia]
Acteonella, d'Orbigny 1843 [Acteonellidae]
Acteonella anchietai, Choffat 1888 [unclassified species]
Acteonella frazierensis, Anderson 1958 [unclassified species]
Acteonella gracilis, Douvillé 1916 [Acteonellidae]
Acteonella rustica, Anderson 1958 [unclassified species]
Acteonellidae, family (Gill 1871) [Architectibranchia]
Acteonellinae, subfamily, Pcelincev 1954 [Acteonidae]
Acteonidae, family, d'Orbigny 1835 [Architectibranchia]
Acteonina, d'Orbigny 1850 [Acteoninidae]
Acteonina (Ovactaeonina) (Cossmann 1895) [unclassified subgenus]
Acteonina attenuata, Lycett 1850 [unclassified species]
Acteonina avenoides, Haas 1953 [unclassified species]
Acteonina bellavistana, Anderson 1958 [unclassified species]
Acteonina berryessensis, Anderson 1958 [unclassified species]
Acteonina blakei, Cox and Arkell 1950 [unclassified species]
Acteonina bleicheri, Cossmann 1895 [unclassified species]
Acteonina buvignieri, Loriol and Pellat 1866 [unclassified species]
Acteonina calafia, Stewart 1927 [unclassified species]
Acteonina californica, Gabb 1864 [unclassified species]
Acteonina carbonaria (de Koninck 1843) [Acteoninidae]
Acteonina cinerea, Hudleston 1882 [unclassified species]
Acteonina colusaensis, Anderson 1958 [unclassified species]
Acteonina fasciata, Lycett 1863 [unclassified species]
Acteonina ferrea, Wilson 1887 [unclassified species]
Acteonina hanseni, Hoare 2004 [Acteoninidae]
Acteonina kirklingtonensis, Lycett 1863 [unclassified species]
Acteonina koizumii, Nützel and Nakazawa 2012 [Acteoninidae]
Acteonina obesa, Haas 1953 [unclassified species]
Acteonina permiana, Hanger and Strong 1998 [Acteoninidae]
Acteonina pupoides, Gabb 1864 [unclassified species]
Acteonina roguensis, Anderson 1958 [unclassified species]
Acteonina solida, Yu 1980 [Acteoninidae]
Acteonina tubifera, Fischer 1964 [Acteoninidae]
Acteonina ursula, Anderson 1958 [unclassified species]
Acteonina ursulagorda, Anderson 1958 [unclassified species]
Acteonina yrekensis, Anderson 1958 [unclassified species]
Acteoninae, subfamily, d'Orbigny 1842 [Acteonidae]
Acteoninidae, family (V.F. Pchelincev and I.A. Korobkov 1960) [Gastropoda]
Acteonininae, subfamily [Acteoninidae]
Acteoninoidea, superfamily, Cossmann 1895 [Gastropoda]
Acteonoida, suborder, d'Orbigny 1842 [Cephalaspidea]
Acteonoidea, superfamily, d'Orbigny 1835 [Architectibranchia]
Acteosaurus, H. von Meyer 1860 [Squamata]
Acteosaurus crassicostatus, Calligaris 1993 [Squamata]
Acteosaurus tommasinii, Meyer 1860 [Squamata]
Actiangulata [Podocopida]
Actinacididae, family, Vaughan and Wells 1943 [Scleractinia]
Actinacis, d'Orbigny 1849 [Actinacididae]
Actinacis alabamensis (Vaughan 1900) [Actinacididae]
Actinacis barretti, Wells 1934 [Actinacididae]
Actinacis caribiensis, Frost and Langenheim 1974 [Actinacididae]
Actinacis cognata, Oppenheim 1901 [Actinacididae]
Actinacis conferta, Reuss 1868 [Actinacididae]
Actinacis cymatoclysta, Felix 1906 [Actinacididae]
Actinacis elegans, Reuss 1854 [Actinacididae]
Actinacis haueri, Reuss 1854 [Actinacididae]
Actinacis magna, Alloiteau 1958 [Actinacididae]
Actinacis martiniana, d’Orbigny 1850 [Actinacididae]
Actinacis michelini (Reuss 1846) [Negoporitidae]
Actinacis miyakoensis, Eguchi 1951 [Actinacididae]
Actinacis multipartita, Oppenheim 1930 [Actinacididae]
Actinacis parvistella, Oppenheim 1930 [Actinacididae]
Actinacis parvulina, Eliasova 1974 [Actinacididae]
Actinacis phineus, Kolosvary 1956 [Actinacididae]
Actinacis remesi, Felix 1903 [Actinacididae]
Actinacis retifera, Trauth 1911 [Poritidae]
Actinacis reussi, Oppenheim 1930 [Actinacididae]
Actinacis rollei, Reuss 1864 [Actinacididae]
Actinacis sawkinsi, Wells 1934 [Actinacididae]
Actinacis spissa (Pocta 1887) [Negoporitidae]
Actinacis spissus, Pocta 1887 [unclassified species]
Actinacis textilis (Pocta 1887) [Negoporitidae]
Actinacis tosaensis, Eguchi 1951 [Calamophylliidae]
Actinacis valverdensis, Wells 1933 [Actinacididae]
Actinaraea, d'Orbigny 1849 [Actinacididae]
Actinaraea arborescens (Felix 1891) [Latomeandridae]
Actinaraea granulata (Münster 1829) [Actinacididae]
Actinaraea michoacanensis, Filkorn and Pantoja-Alor 2009 [Actinacididae]
Actinaraea minuta, Roniewicz 1966 [Actinacididae]
Actinaraea robusta, Roniewicz 1966 [Actinacididae]
Actinaraea tenuis, Morycowa 1971 [Actinacididae]
Actinaraeopsis, Roniewicz 1968 [Haplaraeidae]
Actinaraeopsis araneola, Roniewicz 1968 [Haplaraeidae]
Actinaraeopsis exilis, Roniewicz 1968 [Haplaraeidae]
Actinaraeopsis ventosiana, Morycowa and Masse 2007 [Haplaraeidae]
Actinarea (d'Orbigny 1849) [Actinacididae]
Actinaria, order () [Anthozoa]
Actinastraea (d'Orbigny 1849) [Actinastreidae]
Actinastraea cavernata, Eliasova 1974 [Actinastreidae]
Actinastraea decaphylla madagascariensis, Alloiteau 1958 [Columastreidae]
Actinastraea hexaphylloides (Felix 1906) [Actinastreidae]
Actinastraea idahoensis (Squires 1956) [Actinastreidae]
Actinastraea martini (Smith 1927) [Guembelastraeidae]
Actinastraea minima, Beauvais 1986 [Actinastreidae]
Actinastraea pseudominima, Koby 1897 [unclassified species]
Actinastraea pseudominima major, E. Morycowa 1971 [Actinastraea pseudominima]
Actinastraea pyrenaica, Chevalier 1962 [Actinastreidae]
Actinastraea schafhaeutli (Winckler 1861) [Actinastreidae]
Actinastraea shastensis (Smith 1927) [Pamiroseriidae]
Actinastraeidae, family, Alloiteau 1952 [Scleractinia]
Actinastraeopsis, Sikharulidze 1977 [Isastreidae]
Actinastrea, d'Orbigny 1849 [Actinastreidae]
Actinastrea actinastrae (Turnsek and Mihajlovic 1981) [Actinastreidae]
Actinastrea aequibernensis (Hackemesser 1936) [Actinastreidae]
Actinastrea asteriscus (Weissermel 1900) [Actinastreidae]
Actinastrea bastidensis, Alloiteau 1954 [Actinastreidae]
Actinastrea bellensis (Wells 1933) [Actinastreidae]
Actinastrea benaixensis, Alloiteau 1954 [Actinastreidae]
Actinastrea bernensis (Koby 1885) [Actinastreidae]
Actinastrea besairiei, Alloiteau 1958 [Actinastreidae]
Actinastrea cavernata (Eliasova 1974) [Actinastreidae]
Actinastrea chumbitaroensis, Filkorn and Pantoja-Alor 2009 [Actinastreidae]
Actinastrea crassoramosa (Michelin 1843) [Actinastreidae]
Actinastrea cribellum (Pocta 1887) [Actinastreidae]
Actinastrea decaphylla (Michelin 1846) [Actinastreidae]
Actinastrea decaphylla madagascariensis, Alloiteau 1958 [Actinastreidae]
Actinastrea elongata, Alloiteau 1954 [Actinastreidae]
Actinastrea engolismensis, Alloiteau 1954 [Actinastreidae]
Actinastrea exigua, Alloiteau 1954 [Actinastreidae]
Actinastrea fromenteli, Alloiteau 1954 [Actinastreidae]
Actinastrea furcata (Etallon 1859) [Actinastreidae]
Actinastrea geminata (Goldfuss 1826) [Actinastreidae]
Actinastrea gibbosa (Duncan 1867) [Actinastreidae]
Actinastrea goldfussi, Orbigny 1850 [Actinastreidae]
Actinastrea guadalupae (Roemer 1849) [Actinastreidae]
Actinastrea hexacnema (Quenstedt 1881) [Actinastreidae]
Actinastrea hexamera (Fritzsche 1924) [Actinastreidae]
Actinastrea hexaphylla (Quenstedt 1881) [Actinastreidae]
Actinastrea hexaphylloides (Felix 1906) [Actinastreidae]
Actinastrea hourcqi, Alloiteau 1958 [Actinastreidae]
Actinastrea idahoensis, Squires 1956 [unclassified species]
Actinastrea immersa (Fritsch 1878) [Astrocoeniidae]
Actinastrea inrasa, Eliasova 1974 [Actinastreidae]
Actinastrea juvavica (Frech 1890) [Pamiroseriidae]
Actinastrea kunthi (Bölsche 1871) [Actinastreidae]
Actinastrea lacvivieri, Alloiteau 1954 [Actinastreidae]
Actinastrea major, Morycowa 1971 [Actinastreidae]
Actinastrea matheyi (Koby 1885) [Actinastreidae]
Actinastrea menabensis, Alloiteau 1958 [Actinastreidae]
Actinastrea minima (Fromentel 1857) [Actinastreidae]
Actinastrea minutissima (Gerth 1921) [Astrocoeniidae]
Actinastrea nathani, Kühn 1965 [Astrocoeniidae]
Actinastrea octolamellosa (Michelin 1846) [Actinastreidae]
Actinastrea parasitica (Duncan 1867) [Actinastreidae]
Actinastrea pattoni (Wells 1933) [Actinastreidae]
Actinastrea pedunculata (Duncan 1867) [Actinastreidae]
Actinastrea pentagonalis (Goldfuss 1829) [Actinastreidae]
Actinastrea piveteaui, Alloiteau 1954 [Actinastreidae]
Actinastrea plana (Duncan 1867) [Actinastreidae]
Actinastrea portoricensis (Vaughan 1919) [Astrocoeniidae]
Actinastrea pseudominima (Koby 1897) [Actinastreidae]
Actinastrea pygmaea (Felix 1903) [Actinastreidae]
Actinastrea ramosa (Sowerby 1832) [Actinastreidae]
Actinastrea ramulifera (Etallon 1864) [Actinastreidae]
Actinastrea regularis (Fromentel 1887) [Actinastreidae]
Actinastrea retifera (Stoliczka 1873) [Actinastreidae]
Actinastrea sakalavensis, Alloiteau 1958 [Actinastreidae]
Actinastrea subdecaphylla (Oppenheim 1930) [Actinastreidae]
Actinastrea tendagurensis (Dietrich 1926) [Actinastreidae]
Actinastrea tourtiensis (Bölsche 1871) [Actinastreidae]
Actinastrea trochiformis (Michelin 1843) [Actinastreidae]
Actinastrea urgonensis (Koby 1896) [Actinastreidae]
Actinastrea waltheri (Frech 1890) [Actinastreidae]
Actinastrea whitneyi (Wells 1932) [Actinastreidae]
Actinastreidae, family (Alloiteau 1952) [Scleractinia]
Actineda, Koch 1836 [unclassified genus]
Actineda venustula, Koch and Berendt 1854 [Anystidae]
Actinemys, Agassiz 1857 [Emydidae]
Actinemys hesperia (Hay 1903) [Emydidae]
Actinemys marmorata (Baird and Girard 1852) [Emydidae]
Actinemys owyheensis (Brattstrom and Sturn 1959) [Emydidae]
Actinhelia, d'Orbigny 1849 [Actinacididae]
Actinhelia elegans (Goldfuss 1826) [Actinacididae]
Actiniae, order [Anthozoa]
Actiniaria, order [Anthozoa]
Actinidia, Chandler 1926 [unclassified genus]
Actinidia crassisperma, Chandler 1926 [unclassified species]
Actinidia eocenica, Chandler 1963 [unclassified species]
Actinidia poolensis, Chandler 1963 [unclassified species]
Actinidiaceae, family, E.F. Gilg and E. Werdermann 1824 [Ericales]
Actinidiophyllum, Nathorst 1888 [unclassified genus]
Actinidioxylon, Mueller-Stoll and Maedel-Angeliewa 1969 [unclassified genus]
Actinidioxylon princeps, Ludwig 1860 [unclassified species]
Actiniidae, family, Rafinesque 1815 [Anthozoa]
Actinistia (Cope 1870) [Sarcopterygii]
Actinistia, order (Cope 1870) [Sarcopterygii]
Actinistia, infraclass (Cope 1870) [Sarcopterygii]
Actinistia, Cope 1870 [Sarcopterygii]
Actinistia, class (Cope 1870) [Sarcopterygii]
Actinobacteria, phylum [Negibacteria]
Actinobalanus, Moroni 1867 [Cirripedia]
Actinobatis, Agassiz 1843 [Rajidae]
Actinobatis davisi, Fowler 1958 [Pycnodontidae]
Actinoblatta, Pruvost 1912 [Archimylacridae]
Actinoblatta bucheti, Pruvost 1912 [Archimylacridae]
Actinoblattula, Handlirsch 1906 [Mesoblattinidae]
Actinoblattula brodiei, Handlirsch 1906 [Mesoblattinidae]
Actinoblattula charlesi, Laurentiaux 1946 [Mesoblattinidae]
Actinobolus, Mörch 1853 [Carditidae]
Actinobolus granulata (Say 1824) [Carditidae]
Actinobolus novangliae, Morse 1869 [Carditidae]
Actinobolus tridentata (Say 1826) [Carditidae]
Actinocamax, Miller 1823 [Belemnitellidae]
Actinocamax plenus (de Blainville 1827) [Belemnitellidae]
Actinocamax propinquus, Moberg 1885 [Belemnitellidae]
Actinocarpus, Braun 1840 [unclassified genus]
Actinoceramus, F. B. Meek 1864 [Inoceramidae]
Actinoceras, Bronn 1837 [Actinoceratidae]
Actinoceras abortivum, Flower 1957 [Actinoceratidae]
Actinoceras aequale, Flower 1957 [Actinoceratidae]
Actinoceras altopontense, A. F. Foerste and C. Teichert 1930 [Actinoceratidae]
Actinoceras anticostiense (Billings 1857) [Actinoceratidae]
Actinoceras arcuanotum, Flower 1943 [Actinoceratidae]
Actinoceras blakei, Foord 1888 [Armenoceratidae]
Actinoceras carletonense, Twenhofel 1928 [Actinoceratidae]
Actinoceras curdsvillense, A. F. Foerste and C. Teichert 1930 [Actinoceratidae]
Actinoceras gradatum, Flower 1957 [Actinoceratidae]
Actinoceras huronioides, Flower 1957 [Actinoceratidae]
Actinoceras incantatum, Flower 1957 [Actinoceratidae]
Actinoceras insulaenigrae, Strand 1934 [Actinoceratidae]
Actinoceras kentuckiense, A. F. Foerste and C. Teichert 1930 [Actinoceratidae]
Actinoceras lambei, Foerste 1924 [Actinoceratidae]
Actinoceras lesperancei, Holland and Copper 2008 [unclassified species]
Actinoceras margaretae, Flower 1957 [Actinoceratidae]
Actinoceras mutabile, Flower 1957 [Actinoceratidae]
Actinoceras nummularium (de Sowerby and Murchison 1839) [Armenoceratidae]
Actinoceras nummularius, de Sowerby and Murchison 1839 [unclassified species]
Actinoceras sinclairi, Flower 1957 [Actinoceratidae]
Actinoceras tatei, Etheridge 1893 [unclassified species]
Actinoceras vaughanianum, Girty 1909 [Carbactinoceratidae]
Actinoceras winstoni, Flower 1957 [Actinoceratidae]
Actinoceratidae, family, Saeman 1853 [Actinocerida]
Actinoceratina, suborder, Flower 1950 [Cephalopoda]
Actinoceratoidea, subclass, Teichert et al. 1964 [Cephalopoda]
Actinocerida, order, C. Teichert 1933 [Cephalopoda]
Actinocerites, Hong 2002 [Coleoptera]
Actinocerites punctatus, Hong 2002 [Coleoptera]
Actinochilina [Palaeocopida]
Actinochiri, order, Cope 1872 [unclassified order]
Actinocoelia, Finks 1960 [Chiastoclonellidae]
Actinocoelia maeandrina, Finks 1960 [Chiastoclonellidae]
Actinocoelia ossa, Deng 1981 [Chiastoclonellidae]
Actinocoelia verrucosa, Finks 1960 [Chiastoclonellidae]
Actinocoenia [unclassified genus]
Actinocoenia clathrata, Etallon 1859 [Acroporidae]
Actinocoenia lobata, Etallon 1858 [Acroporidae]
Actinocoenia stellata, Etallon 1859 [Acroporidae]
Actinoconchus [Athyrididae]
Actinoconchus expansus (Phillips 1836) [Athyrididae]
Actinoconchus lamellosa (C. Léveillé 1835) [Athyrididae]
Actinoconchus lamellosus (C. Léveillé 1835) [Athyrididae]
Actinoconchus planosulcatus (Phillips 1836) [Athyrididae]
Actinoconchus shenshuensis, Lee and Su 1980 [Athyrididae]
Actinoconchus uralicus (Grabau 1934) [Athyrididae]
Actinoconites, Steinmann 1910 [unclassified genus]
Actinoconus, Yü 1979 [Mollusca]
Actinoconus pyriformis, Yü 1979 [Actinoconus]
Actinocrinites, J. S. Miller 1821 [Actinocrinitidae]
Actinocrinites batheri (G. F. Whidborne 1896) [Actinocrinitidae]
Actinocrinites brouweri (Wanner 1924) [Actinocrinitidae]
Actinocrinites tesseracontadactylus, Goldfuss 1831 [unclassified species]
Actinocrinites zhaoae, Waters et al. 2003 [Actinocrinitidae]
Actinocrinitidae, family, T. Austin and T. Austin 1842 [Monobathrida]
Actinocrinitinae, subfamily, T. Austin and T. Austin 1842 [Actinocrinitidae]
Actinocrinus [unclassified genus]
Actinocrinus batheri, G. F. Whidborne 1896 [Actinocrinitidae]
Actinocrinus brouweri, Wanner 1924 [Actinocrinitidae]
Actinocrinus porteri, G. F. Whidborne 1896 [Actinocrinitidae]
Actinocyathus, d'Orbigny 1849 [Axophyllidae]
Actinocyclina [Foraminifera]
Actinocyclus, Ehrenberg 1838 [Bacillariophyta]
Actinocyclus, Schrammen 1912 [Ventriculitidae]
Actinocyclus alternans (Roemer 1841) [Ventriculitidae]
Actinocyclus ellipticus, Grunow 1883 [unclassified species]
Actinocyclus ingens, Rattray 1890 [unclassified species]
Actinocyclus mirus, Schrammen 1912 [Ventriculitidae]
Actinocyclus octonarius, Ehrenberg 1838 [unclassified species]
Actinocyclus senarius, Ehrenberg 1838 [unclassified species]
Actinocyclus tenellus (Brébisson 1854) [unclassified species]
Actinocystinae, subfamily, Wedekind 1927 [Ptenophyllidae]
Actinocythereis, Puri 1953 [Trachyleberididae]
Actinocythereis captionis, Hazel 1983 [Trachyleberididae]
Actinocythereis exanthemata, Ulrich and Bassler 1904 [unclassified species]
Actinocythereis exanthemata gomillionensis (Howe et al. 1935) [unclassified subspecies]
Actinocythereis microagrenon, Ayress 1995 [Trachyleberididae]
Actinocythereis orientalis, Guernet 1985 [unclassified species]
Actinodesma, Sandberger 1856 [Pterineidae]
Actinodesma (Actinodesma), Sandberger 1856 [Pterineidae]
Actinodictya [Reticulosa]
Actinodictyidae, family, Khalfina and Yavorsky 1973 [Clathrodictyida]
Actinodictyon, Parks 1909 [Actinodictyidae]
Actinodictyon canadense, Parks 1909 [Actinodictyidae]
Actinodictyon suevicum, Nicholson 1886 [Actinodictyidae]
Actinodiscaceae, family [unclassified family]
Actinodiscus, Smith and Paul 1982 [Cyclocystoididae]
Actinodiscus wrighti (J.L. Begg 1939) [Cyclocystoididae]
Actinodochmioceras, Chen 1981 [Cephalopoda]
Actinodon, Gaudry 1866 [Eryopidae]
Actinodon brevis, Gaudry 1866 [Eryopidae]
Actinodon frossardi, Gaudry 1866 [Eryopidae]
Actinodon germanicus, Kuhn 1939 [Eryopidae]
Actinodon risinensis, Wadia and Swinton 1928 [Lysipterygiidae]
Actinodonta, Philipps 1848 [Grammysiidae]
Actinodonta cambriensis (Hicks 1873) [Grammysiidae]
Actinodonta chaschuili, Aceñolaza and Toselli 1977 [unclassified species]
Actinodonta cuneata, Phillips 1848 [Grammysiidae]
Actinodonta homfrayi (Hicks 1873) [Grammysiidae]
Actinodonta naranjoana (de Verneuil and Barrande 1855) [unclassified species]
Actinodonta ornata (Hicks 1873) [Grammysiidae]
Actinodonta plana (Hicks 1873) [Grammysiidae]
Actinodonta ramseyensis (Hicks 1873) [Grammysiidae]
Actinodontida, order (Douvillé 1912) [Bivalvia]
Actinodontidae, family, Lydekker 1885 [Archegosauriformes]
Actinodontidae, family, Davies 1933 [Actinodontida]
Actinodontoida, order, Douvillé 1912 [Bivalvia]
Actinodontoidea, superfamily, Douvillé 1912 [Actinodontida]
Actinodontophora, Ichikawa 1951 [Actinodontophoridae]
Actinodontophora katsurensis, Ichikawa 1951 [Actinodontophoridae]
Actinodontophora qinglongensis, Xu and Lan 1980 [Actinodontophoridae]
Actinodontophoridae, family, Newell 1969 [Unionida]
Actinodontophoroidea, superfamily, Newell 1969 [Unionida]
Actinofungia [Axinellida]
Actinofungia astroites (Münster 1841) [Axinellida]
Actinohymen, Carpenter 1962 [Bardohymenidae]
Actinohymen russelli, Carpenter 1962 [Bardohymenidae]
Actinoites, Duan 1984 [Chancelloriidae]
Actinoites diclinatus, Duan 1984 [Chancelloriidae]
Actinoites simplex, Duan 1984 [Chancelloriidae]
Actinoites tetractina, Duan 1984 [Chancelloriidae]
Actinoites universalis, Duan 1984 [Chancelloriidae]
Actinolepida, suborder (Miles 1973) [unclassified suborder]
Actinolepidae, family, Gross 1940 [Arthrodira]
Actinolepidoidei, suborder [Arthrodiriformes]
Actinolepina, suborder, Miles 1973 [unclassified suborder]
Actinolepis, Agassiz 1845 [Actinolepidae]
Actinolepis magna, Mark-Kurik 1973 [unclassified species]
Actinolepis tuberculata, Agassiz 1845 [Actinolepidae]
Actinoleuca, Oliver 1926 [Patellogastropoda]
Actinolobus, Eichwald 1860 [Styginidae]
Actinolobus americanus, Raymond 1916 [Styginidae]
Actinolobus atavus (Eichwald 1857) [Styginidae]
Actinomena, Opik 1930 [Strophomenidae]
Actinomena amusi (Verneuil 1845) [Strophomenidae]
Actinomena arachnoidea (Lindström 1880) [unclassified species]
Actinomena occidens, Oraspold 1956 [Strophomenidae]
Actinomena orta (Öpik 1930) [Strophomenidae]
Actinomena quitana (Öpik 1930) [unclassified species]
Actinometra, Müller 1841 [unclassified genus]
Actinometra cristata, Hartlaub 1912 [unclassified species]
Actinomma, Haeckel 1862 [Actinommidae]
Actinomma davisensis, Pessagno 1976 [Actinommidae]
Actinomma frigida, Kiessling 1999 [Actinommidae]
Actinomma interessanta, Kiessling 1999 [Actinommidae]
Actinomma ishidai, Sashida and Uematsu 1996 [Actinommidae]
Actinomma longinggapensis, Kiessling 1999 [Actinommidae]
Actinomma matsuokai, Sashida and Uematsu 1996 [Actinommidae]
Actinomma siciliensis, Kito and De Wever 1994 [Actinommidae]
Actinomma tochidaniensis, Sashida and Uematsu 1996 [Actinommidae]
Actinomma verwirra, Kiessling 1999 [Actinommidae]
Actinommidae, family, Haeckel 1862 [Spumellaria]
Actinomminae, subfamily, Takahashi 1991 [Actinommidae]
Actinomorpha, Flower 1943 [Valcouroceratidae]
Actinomorpha pupa, Flower 1943 [Valcouroceratidae]
Actinomycites, Ellis 1916 [unclassified genus]
Actinomycodium, Zalessky 1915 [unclassified genus]
Actinomycodium floccidum, Zalessky 1915 [unclassified species]
Actinomylacris, Handlirsch 1906 [Mylacridae]
Actinomylacris carbonum (Scudder 1884) [Mylacridae]
Actinomylacris similis, Carpenter 1934 [Mylacridae]
Actinomylacris vicina, Handlirsch 1906 [Archimylacridae]
Actinopeltis, Hawle and Corda 1847 [Cheiruridae]
Actinopeltis feildeni, Poulsen 1946 [unclassified species]
Actinophlebia, Handlirsch 1906 [Prohemerobiidae]
Actinophlebia abscissa (Bode 1953) [Prohemerobiidae]
Actinophlebia aenea, Handlirsch 1939 [Prohemerobiidae]
Actinophlebia anglicana, Tillyard 1933 [Prohemerobiidae]
Actinophlebia intermixta (Scudder 1885) [Prohemerobiidae]
Actinophlebia megapolitana (Geinitz 1888) [Prohemerobiidae]
Actinophlebia multivenosa (Bode 1953) [Neuroptera]
Actinophlebia parallela, Handlirsch 1939 [Prohemerobiidae]
Actinophlebioides, Jepson et al. 2009 [Neuroptera]
Actinophlebioides valdensis, Jepson et al. 2009 [Neuroptera]
Actinophorus, Newberry 1888 [unclassified genus]
Actinophorus clarkii, Newberry 1888 [unclassified species]
Actinophrentis, Ivanovskiy 1967 [Antiphyllidae]
Actinophrentis bonespringense, Fedorowski 1987 [Antiphyllidae]
Actinophrentis columnare, Fedorowski 1987 [Antiphyllidae]
Actinophycus, Korde 1954 [unclassified genus]
Actinophycus obrutschevi, Korde 1954 [unclassified species]
Actinophyllum, Phillips 1848 [unclassified genus]
Actinophyllum plicatum, Phillips 1848 [unclassified species]
Actinophyma [Echinoidea]
Actinophyma spectabile, Cotteau and Gauthier 1895 [unclassified species]
Actinopoda, phylum [Protista]
Actinopodium, Høeg 1942 [unclassified genus]
Actinopodium nathorstii, Høeg 1942 [unclassified species]
Actinopora, d'Orbigny 1852 [Cyclostomata]
Actinopora, Vinassa da Regny 1918 [Syringolitidae]
Actinoporella [Dasycladales]
Actinopsis [Actiniidae]
Actinopterella, Williams 1908 [Pterineidae]
Actinopterella tessellata, Wilson 1956 [Myodakryotidae]
Actinopterellinae, subfamily, Maillieux 1931 [unclassified subfamily]
Actinopteri, subclass, Cope 1871 [Actinopterygii]
Actinopteri, infraclass (Cope 1871) [Actinopterygii]
Actinopteri, class (Cope 1871) [Actinopterygii]
Actinopteri, superorder (Cope 1871) [unclassified superorder]
Actinopteria, Hall 1884 [Pterineidae]
Actinopteria acinaces, Talent 1963 [Pterineidae]
Actinopteria boydi (Conrad 1842) [unclassified species]
Actinopteria delta, Hall 1883 [unclassified species]
Actinopteria epsilon, Hall 1883 [unclassified species]
Actinopteria pumila, Bogolepova and Kříž 1995 [Pterineidae]
Actinopteria resplendens, Talent 1963 [Pterineidae]
Actinopterinia, Isberg 1934 [Pteriidae]
Actinopterinia semicircularis, Isberg 1934 [Pteriidae]
Actinopteris, Schenk 1865 [unclassified genus]
Actinopteris bengalensis, Feistmantel 1876 [unclassified species]
Actinopteris peltata, Goeppert 1865 [unclassified species]
Actinopterygia, superorder (Cope 1871) [Actinopterygii]
Actinopterygii, class, E. D. Cope 1887 [Osteichthyes]
Actinopterygii (E. D. Cope 1887) [Osteichthyes]
Actinopterygii, superclass (E. D. Cope 1887) [Osteichthyes]
Actinopterygii, subclass (E. D. Cope 1887) [Osteichthyes]
Actinopterygii, order (E. D. Cope 1887) [Osteichthyes]
Actinoptilon, Bode 1953 [Psychopsidae]
Actinoptilon violatum, Bode 1953 [Psychopsidae]
Actinoptychoideae, subfamily [unclassified subfamily]
Actinoptychus, Ehrenberg 1839 [Bacillariophyta]