ammonites
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Gateway to the Paleobiology Database

O. P. Hay 1902

Taxonomic names tied to this reference:
Acanthodes pristis Clarke 1885
Acanthodes semistriatus Woodward 1892
Acanthodii Owen 1846
Acanthoessus affinis Whiteaves 1887
Acanthoessus concinnus Whiteaves 1887
Acanthoessus pristis Clarke 1885
Acanthoessus semistriatus Woodward 1892
Acantholepis pustulosus Newberry 1875
Acentrophorus chicopensis Newberry 1888
Aceratherium incisivus Cuvier 1824
Acondylacanthus aequicostatus Saint John and Worthen 1875
Acondylacanthus gracilis Saint John and Worthen 1875
Acondylacanthus gracillimus Newberry and Worthen 1866
Acondylacanthus mudgianus Saint John and Worthen 1883
Acondylacanthus rectus Saint John and Worthen 1883
Acondylacanthus xiphias Saint John and Worthen 1883
Acrodus emmonsi Leidy 1872
Acrodus humilis Leidy 1872
Acrolepis sedgwicki Agassiz 1833
Actinophorus Newberry 1888
Actinophorus clarkii Newberry 1888
Aelurotherium leidyana Osborn and Wortman 1892
Aetobatis eximius Leidy 1855
Aetobatus perspicuus Leidy 1855
Agassichthys manni Newberry 1857
Agassichthys sullivanti Newberry 1857
Agassizichthys Newberry 1857
Agassizichthys manni Newberry 1857
Agassizodus scitulus Saint John and Worthen 1875
Agassizodus virginianus Saint John and Worthen 1875
Agriochoerinae Cope 1884
Agriochoerus auritus Leidy 1852
Alces americanus Jardine 1837
Alcoidea Stejneger 1885
Alectoropodes Cones 1884
Amacanthus gibbosus Newberry and Worthen 1866
Ambloctonidae E. D. Cope 1877
Amblyctonidae E. D. Cope 1877
Amblyctonidae E. D. Cope 1877
Amblypterus macropterus Agassiz 1843
Ameiurus cancellatus Cope 1891
Ameiurus maconnellii Cope 1891
Amyzon brevipinne Cope 1893
Amyzon commune Cope 1874
Amyzon fusiforme Cope 1875
Amyzon pandatum Cope 1875
Anaclitacanthus semicostatus Saint John and Worthen 1875
Anchybopsis latus Cope 1870
Ancistrodon texanus Dames 1883
Anisacodon Marsh 1875
Anogmius evolutus Cope 1877
Anogmius intermedius Loomis 1900
Anogmius rotundus Loomis 1900
Anogmius zitteli Loomis 1900
Anthracopus Leidy 1879
Antliodus arcuatus Newberry 1889
Antliodus cucullus Newberry and Worthen 1866
Antliodus gracilis Saint John and Worthen 1875
Antliodus mucronatus Newberry and Worthen 1866
Antliodus parvulus Newberry and Worthen 1866
Antliodus perovalis Saint John and Worthen 1875
Antliodus politus Newberry and Worthen 1866
Antliodus robustus Newberry and Worthen 1866
Antliodus sarcululus Newberry and Worthen 1870
Antliodus similis Newberry and Worthen 1866
Antliodus simplex Newberry and Worthen 1866
Antliodus sulcatus Newberry and Worthen 1866
Apedodus Leidy 1856
Apedodus priscus Leidy 1856
Aphelichthys Cope 1893
Apsopelix sauriformis Cope 1871
Archaeobatis gigas Newberry 1878
Arctomys tortus Cope 1869
Ardeoidea Stejneger 1885
Artediellus Jordan 1865
Artediellus atlanticus Jordan and Evermann 1898
Asineops squamifrons Cope 1870
Aspidichthys clavatus Newberry 1873
Aspidichthys notabilis Whiteaves 1892
Aspidodus crenulatus Newberry and Worthen 1866
Aspidoganoidei Gill 1876
Asteroptychius bellulus Saint John and Worthen 1875
Asteroptychius elegans Newberry 1889
Asteroptychius gracilis Newberry 1897
Asteroptychius keokuk Saint John and Worthen 1875
Asteroptychius sanctiludovici Saint John and Worthen 1875
Asteroptychius tenellus Saint John and Worthen 1883
Asteroptychius tenuis Saint John and Worthen 1875
Asteroptychius triangularis Newberry and Worthen 1870
Asteroptychius vetustus Saint John and Worthen 1875
Asterosteus stenocephalus Newberry 1875
Athya Boie 1822
Athya marila Linnaeus 1761
Baropus Marsh 1894
Baropus lentus Marsh 1894
Bascanion constrictor Linnaeus 1758
Baseodon reversus Leidy 1865
Batacanthus baculiformis Saint John and Worthen 1875
Batacanthus necis Saint John and Worthen 1883
Bathycheilodus macisaacsii Saint John and Worthen 1875
Bathyopsidae Osborn 1898
Belodontia Marsh 1895
Berycoidea Gill 1872
Beryx insculptus Cope 1869
Blarina brevicaudus Say 1823
Booidea
Bos pallasii De Kay 1828
Bothriolepis nitida Leidy 1856
Brontichthys clarki Claypole 1894
Brontotherium ophryas Cope 1873
Callognathus regularis Newberry 1889
Callognathus serratus Newberry 1889
Calopodus apicalis Saint John and Worthen 1875
Campodus scitulus Saint John and Worthen 1875
Campodus virginianus Saint John and Worthen 1875
Canis cinereoargentatus Schreber 1775
Canis latidentatus Cope 1899
Carcharhininae Jordan and Evermann 1896
Carcharhinus commersoni Blainville 1816
Carcharhinus lamia Cuvier 1817
Carcharias lamia Cuvier 1817
Carchariinae Muller and Henle
Carcharodon contortidens Emmons 1858
Carcharodontinae Gill 1892
Carinatae Merrem 1813
Cathartides Coues 1884
Catopteridae Woodward 1890
Catopterus anguilliformis Redfield 1841
Catopterus macrurus Redfield 1841
Catopterus minor Newberry 1888
Catopterus ornatus Newberry 1888
Catopterus parvulus Redfield 1841
Catopterus redfieldi Egerton 1847
Catostomus batrachops Cope 1883
Catostomus labiatus Ayres 1855
Cecomorphae Huxley 1867
Cephalaspis lloydii Agassiz 1843
Ceratodus favosus Cope 1884
Ceratoptera unios Leidy 1876
Cervalces americanus Clinton 1822
Cervus tarandus caribou Gmelin 1788
Chaetodipterus faber Broussonet 1782
Chaetodon faber Broussonet 1782
Cheiracanthus costellatus Traquair 1884
Cheirodus acutus Newberry 1856
Cheirolepis traillii L. Agassiz 1835
Chelydosauria Cope 1898
Chenomorphae Huxley 1867
Chirodus acutus Newberry 1856
Chitinodus Stjohn and Worthen 1883
Chitinodus antiquus Saint John and Worthen 1883
Chitinodus latus Leidy 1857
Chitinodus liratus Saint John and Worthen 1883
Chitinodus rugosus Newberry and Worthen 1866
Chitinodus springeri Saint John and Worthen 1883
Chitinodus tribulis Stjohn and Worthen 1883
Chitonodus antiquus Saint John and Worthen 1883
Chitonodus liratus Saint John and Worthen 1883
Chitonodus springeri Saint John and Worthen 1883
Chomatodus affinis Newberry and Worthen 1866
Chomatodus angularis Newberry and Worthen 1866
Chomatodus angustus Newberry 1879
Chomatodus chesterensis Saint John and Worthen 1875
Chomatodus comptus Saint John and Worthen 1875
Chomatodus costatus Newberry and Worthen 1866
Chomatodus cultellus Newberry and Worthen 1866
Chomatodus elegans Newberry and Worthen 1866
Chomatodus gracillimus Newberry and Worthen 1866
Chomatodus inconstans Saint John and Worthen 1875
Chomatodus incrassatus Saint John and Worthen 1875
Chomatodus insignis Leidy 1857
Chomatodus loriformis Newberry and Worthen 1866
Chomatodus molaris Newberry and Worthen 1866
Chomatodus multiplicatus Newberry and Worthen 1866
Chomatodus obscurus Leidy 1857
Chomatodus parallelus Saint John and Worthen 1875
Chomatodus pusillus Newberry and Worthen 1866
Chomatodus selliformis Newberry 1879
Chomatodus varsouviensis Saint John and Worthen 1875
Chomatodus venustus Leidy 1857
Cimolichthys dirus Leidy 1857
Cimolomys agilis Marsh 1892
Cimolomys parvus Marsh 1892
Cistudinidae Cope 1882
Cladodus acuminatus Newberry 1856
Cladodus alternatus Saint John and Worthen 1875
Cladodus angulatus Newberry and Worthen 1866
Cladodus concinnus Newberry 1875
Cladodus costatus Newberry and Worthen 1866
Cladodus deflexus Newberry and Worthen 1870
Cladodus euglypheus Saint John and Worthen 1875
Cladodus exiguus Saint John and Worthen 1875
Cladodus exilis Saint John and Worthen 1875
Cladodus fulleri Saint John and Worthen 1875
Cladodus fyleri Newberry 1889
Cladodus gomphoides Saint John and Worthen 1875
Cladodus gracilis Newberry and Worthen 1866
Cladodus hertzeri Newberry 1875
Cladodus ischypus Newberry and Worthen 1870
Cladodus keokuk Saint John and Worthen 1875
Cladodus kepleri Newberry 1888
Cladodus lamnoides Newberry and Worthen 1866
Cladodus micropus Newberry and Worthen 1866
Cladodus monroei Eastman 1900
Cladodus pandatus Saint John and Worthen 1875
Cladodus parvulus Newberry 1875
Cladodus pattersoni Newberry 1875
Cladodus politus Newberry and Worthen 1866
Cladodus raricostatus Saint John and Worthen 1875
Cladodus rivipetrosi Claypole 1893
Cladodus romingeri Newberry 1875
Cladodus sinuatus Claypole 1893
Cladodus subulatus Newberry 1875
Cladodus terrelli Newberry 1899
Cladodus tumidus Newberry 1899
Cladodus turritus Newberry and Worthen 1866
Cladodus zygopus Newberry and Worthen 1866
Cladoselache fyleri Newberry 1889
Cladoselache kepleri Newberry 1888
Cladoselache sinuatus Claypole 1893
Clastes aganus Cope 1877
Clastes cuneatus Cope 1884
Clastes cycliferus Cope 1873
Clastes integer Cope 1877
Clidastes rex Marsh 1872
Clidastes validus Cope 1868
Clidastes westii Williston and Case 1892
Climaxodus brevis Newberry 1856
Coccosteus acadicus Whiteaves 1881
Coccosteus canadensis Woodward 1892
Coccosteus cuyahogae Claypole 1898
Coccosteus halmodeus Clarke 1894
Coccosteus occidentalis Newberry 1875
Cochliodus crassus Newberry and Worthen 1866
Cochliodus leidyi Saint John and Worthen 1883
Cochliodus nitidus Leidy 1857
Cochliodus vanhornii Saint John and Worthen 1883
Cocytinus gyrinoides Cope 1871
Coelacanthus ornatus Newberry 1856
Coelodus brownii Cope 1894
Coelodus saturnus Haeckel 1856
Coelodus stantoni Williston 1900
Coelorhynchus ornatus Leidy 1856
Coelosteus Newberry 1887
Coelosteus ferox Newberry 1887
Colymboidea Stejneger 1885
Colymbus holboelii Reinhardt 1854
Compsacanthus laevis Newberry 1856
Conchiopsis Cope 1873
Conchiopsis filiferus Cope 1873
Conchodus ostreaformis McCoy 1848
Conchodus plicatus Dawson 1868
Copodus pusillus Saint John and Worthen 1883
Copodus vanhornii Saint John and Worthen 1883
Cosmacanthus bullatus Saint John and Worthen 1875
Cosmacanthus malcolmsoni Agassiz 1844
Cosmacanthus stellatus Saint John and Worthen 1875
Cottus cryptotremus Cope 1883
Cottus divaricatus Cope 1883
Cottus hypoceras Cope 1883
Cottus pontifex Cope 1883
Crocodylus brevicollis Marsh 1871
Crocodylus chamensis Cope 1874
Crocodylus clavis E. D. Cope 1871
Crocodylus elliottii Leidy 1871
Crocodylus heterodon E. D. Cope 1873
Crocodylus marylandicus Clarke 1895
Crocodylus serratus Cope 1872
Crocodylus squankensis Marsh 1869
Ctenacanthus costatus Newberry and Worthen 1866
Ctenacanthus depressus Newberry 1897
Ctenacanthus excavatus Saint John and Worthen 1875
Ctenacanthus fallax Woodward 1891
Ctenacanthus formosus Newberry 1873
Ctenacanthus gemmatus Saint John and Worthen 1875
Ctenacanthus gracillimus Newberry and Worthen 1866
Ctenacanthus gradocostatus Saint John and Worthen 1875
Ctenacanthus gurleyi Newberry 1897
Ctenacanthus keokuk Saint John and Worthen 1875
Ctenacanthus marshii Newberry 1873
Ctenacanthus mayi Newberry and Worthen 1870
Ctenacanthus parvulus Newberry 1875
Ctenacanthus pellensis Saint John and Worthen 1883
Ctenacanthus pugiunculus Saint John and Worthen 1875
Ctenacanthus sculptus Saint John and Worthen 1875
Ctenacanthus similis Saint John and Worthen 1875
Ctenacanthus speciosus Saint John and Worthen 1875
Ctenacanthus triangularis Newberry 1873
Ctenacanthus vetustus Newberry 1873
Ctenacanthus wrighti Newberry 1884
Ctenacanthus xiphias Saint John and Worthen 1883
Ctenodus angustus Newberry 1897
Ctenodus dialophus Cope 1878
Ctenodus fleisheri Williams 1882
Ctenodus ohioensis Cope 1875
Ctenodus periprion Cope 1878
Ctenodus porrectus Cope 1878
Ctenodus pusillus Cope 1877
Ctenodus serratus Newberry 1875
Ctenodus wagneri Newberry 1889
Ctenopetalus bellulus Saint John and Worthen 1875
Ctenopetalus limatulus Saint John and Worthen 1875
Ctenopetalus medius Saint John and Worthen 1875
Ctenopetalus serratus Owen 1840
Ctenopetalus vinosus Saint John and Worthen 1875
Ctenoptychius acuminatus Saint John and Worthen 1875
Ctenoptychius cristatus Dawson 1868
Ctenoptychius pertenius Saint John and Worthen 1875
Cyathaspis acadica Matthew 1886
Cyclopteroidea Gill 1889
Cyclopterus lumpus Linnaeus 1788
Cymatodus oblongus Newberry and Worthen 1870
Cynoidea Flower 1869
Cyprinodon levatus Cope 1870
Cyrtacanthus Newberry 1873
Cyrtacanthus dentatus Newberry 1873
Dactylodus excavatus Saint John and Worthen 1866
Dactylodus inflexus Newberry and Worthen 1866
Dactylodus latus Newberry 1897
Dactylodus minimus Saint John and Worthen 1875
Dactylodus princeps Newberry and Worthen 1866
Dactylodus rectus Newberry 1897
Dama ensifer Cope 1889
Daphoenus robustus Scott 1897
Daptinus broadheadi Stewart 1898
Dasyatis carolinensis Emmons 1858
Dasyatis hastata De Kay 1842
Dasyatis pastinica Linnaeus 1758
Dasyatis ujus Rafinesque 1810
Deinictis bombifrons Adams 1895
Deinictis fortis Adams 1895
Deinictis major F. Lucas 1898
Deltodopsis affinis Saint John and Worthen 1883
Deltodopsis angustus Newberry and Worthen 1870
Deltodopsis bialveatus Saint John and Worthen 1883
Deltodopsis convolutus Saint John and Worthen 1883
Deltodopsis exornatus Saint John and Worthen 1883
Deltodopsis inflexus Saint John and Worthen 1883
Deltodopsis sanctiludovici Saint John and Worthen 1883
Deltodus alatus Newberry and Worthen 1870
Deltodus angustus Newberry and Worthen 1870
Deltodus cinctulus Saint John and Worthen 1883
Deltodus cinctus Newberry 1879
Deltodus cingulatus Newberry and Worthen 1866
Deltodus fasciatus Newberry and Worthen 1870
Deltodus grandis Newberry 1879
Deltodus inornatus Newberry 1897
Deltodus intermedius Saint John and Worthen 1883
Deltodus latior Saint John and Worthen 1883
Deltodus littoni Newberry and Worthen 1870
Deltodus obliquus Saint John and Worthen 1883
Deltodus parvus Saint John and Worthen 1883
Deltodus powellii Saint John and Worthen 1883
Deltodus propinquus Saint John and Worthen 1883
Deltodus rhomboideus Newberry and Worthen 1866
Deltodus stellatus Newberry and Worthen 1866
Deltodus trilobus Saint John and Worthen 1883
Deltodus undulatus Newberry and Worthen 1866
Deltoptychius expansus Saint John and Worthen 1883
Deltoptychius nitidus Leidy 1857
Deltoptychius primus Saint John and Worthen 1883
Deltoptychius varsoviensis Saint John and Worthen 1883
Deltoptychius wachsmuthi Saint John and Worthen 1883
Dendrodus arisaigensis Whiteaves 1896
Desmiodus costelliferus Saint John and Worthen 1875
Desmiodus ligoniformis Saint John and Worthen 1875
Desmiodus minusculus Newberry and Worthen 1866
Desmiodus tumidus Saint John and Worthen 1875
Diacranodus texensis Cope 1888
Diastichus Cope 1870
Diastichus macrodon Cope 1870
Diastichus parvidens Cope 1870
Dicrocerus Cope 1875
Dictyodus Owen 1839
Dictyopyge macrura Redfield 1841
Dictyorhabdus priscus Walcott 1891
Didelphis comstocki Cope 1884
Didymodus texensis Cope 1888
Dinichthyinae Newberry 1888
Dinichthys canadensis Whiteaves 1892
Dinichthys clarki Claypole 1892
Dinichthys corrugatus Newberry 1889
Dinichthys curtus Newberry 1888
Dinichthys gouldii Newberry 1885
Dinichthys gracilis Claypole 1893
Dinichthys halmodeus Clarke 1894
Dinichthys intermedius Newberry 1889
Dinichthys lincolni Claypole 1893
Dinichthys minor Newberry 1878
Dinichthys newberryi Clarke 1885
Dinichthys precursor Newberry 1889
Dinichthys prentisclarki Claypole 1896
Dinichthys ringuebergi Newberry 1889
Dinichthys terrelli Miller 1892
Dinichthys tuberculatus Newberry 1888
Diodon vetus Leidy 1855
Diodontoidea Gill 1884
Diplodus duplicatus Newberry and Worthen 1866
Diplodus priscus Eastman 1899
Diplodus striatus Eastman 1899
Diplognathus mirabilis Newberry 1878
Diplostoma bulbivorum Richardson 1829
Dipterus (Ctenodus) minutus Newberry 1889
Dipterus (Ctenodus) nelsoni Newberry 1889
Dipterus calvini Eastman 1900
Dipterus costatus Eastman 1900
Dipterus flabelliformis Newberry 1889
Dipterus fleisheri Williams 1882
Dipterus minutus Newberry 1889
Dipterus mordax Eastman 1900
Dipterus nelsoni Newberry 1889
Dipterus sherwoodi Newberry 1875
Dipterus uddeni Eastman 1900
Dirrhizodon elongatus Klunziger 1871
Dittodus acinaces Dawson 1860
Dittodus compressus Newberry 1856
Dittodus gracilis Newberry 1856
Dittodus latus Newberry 1856
Dittodus lucasi Hay 1900
Dittodus penetrans Dawson 1868
Dittodus priscus Eastman 1899
Dittodus striatus Eastman 1899
Doliodus problematicus Woodward 1892
Drepanacanthus anceps Newberry and Worthen 1866
Drepanacanthus reversus Saint John and Worthen 1875
Dromaeognathae Huxley 1867
Dromaeopappi Stejneger 1885
Dromopus agilis Marsh 1894
Echinorhinus spinosus Gmelin 1789
Eczematolepis fragilis Newberry 1857
Eczematolepis pustulosus Newberry 1875
Edaphodon fecundus Cope 1875
Edaphodon gaskillii Cope 1875
Edaphodon incrassatus Cope 1875
Edaphodon laterigerus Cope 1869
Edaphodon solidulus Cope 1869
Edaphodon stenobryus Cope 1875
Edaphodon tripartitus Cope 1875
Edestus giganteus Newberry 1888
Edestus heinrichsii Newberry and Worthen 1870
Elonichthys browni Jackson 1851
Elonichthys elegans Emmons 1860
Elonichthys macropterus Agassiz 1843
Empo lisbonensis Stewart 1899
Enchodus amicrodus Stewart 1898
Enchodus calliodon Cope 1872
Enchodus dolichus Cope 1875
Enchodus parvus Stewart 1898
Enchodus pressidens Cope 1889
Enchodus shumardii J. Leidy 1856
Eohyidae Marsh 1894
Epicordylus Cope 1878
Erethizon cloacinus Cope 1871
Erisichthe dimidiata Cope 1878
Eryops erythroliticus Cope 1878
Eryops platypus Cope 1877
Eulamia lamia Cuvier 1817
Eunemacanthus costatus Newberry and Worthen 1866
Euphanerops longaevus Woodward 1900
Eurhipidura Gill 1874
Eurylepis insculptus Newberry 1856
Eurylepis minimus Newberry 1873
Eurylepis striolatus Newberry 1873
Eurynotus tenuiceps Agassiz 1843
Felis ruffus Schreber 1777
Fissodus bifidus Saint John and Worthen 1875
Galeocerdo crassidens Cope 1872
Galeocerdo hartvelli Cope 1872
Galeocerdo hartwellii Cope 1872
Galeocerdo subcrenatus Emmons 1858
Galeocerdo tigrinus Müller and Henle 1838
Gamphacanthus politus Newberry 1889
Gamphacanthus uddeni Lindahl 1897
Gampsacanthus Saint John and Worthen 1875
Gampsacanthus latus Saint John and Worthen 1875
Gampsacanthus squamosus Saint John and Worthen 1875
Gampsacanthus typus Saint John and Worthen 1875
Ganorhynchus beecheri Newberry 1889
Gasterosteus bispinosus Walbaum 1792
Gastornithes Cope 1889
Geisacanthus bullatus Saint John and Worthen 1875
Geisacanthus stellatus Saint John and Worthen 1875
Gephyura Cope 1891
Gephyura concentrica Cope 1891
Gigandipus minor E. Hitchcock 1858
Gigantitherium minor E. Hitchcock 1858
Ginglymostoma cirratum Gmelin 1789
Ginglymostominae Gill 1862
Glyptaspis verrucosa Newberry 1889
Glyptolepis quebecensis Whiteaves 1889
Glyptopomus minor Agassiz 1844
Gonatodus brainerdi Thomas 1853
Gorgonichthys clarki Claypole 1892
Grypodon texanus Dames 1883
Gyracanthus alleni Newberry 1873
Gyracanthus compressus Newberry 1873
Gyracanthus cordatus Saint John and Worthen 1883
Gyracanthus duplicatus Dawson 1868
Gyracanthus inornatus Newberry 1889
Gyracanthus magnificus Dawson 1868
Gyracanthus sherwoodi Newberry 1889
Halecomorphi E. D. Cope 1872
Haplolepis corrugata Newberry 1856
Haplolepis granulata Newberry 1856
Haplolepis minima Newberry 1873
Haplolepis ornatissima Newberry 1856
Haplolepis ovoidea Newberry 1856
Haplolepis serrata Newberry 1856
Haplolepis striolata Newberry 1873
Haplolepis tuberculata Newberry 1856
Haplomi
Helodus angulatus Newberry and Worthen 1866
Helodus biformis Newberry and Worthen 1866
Helodus carbonarius Newberry and Worthen 1866
Helodus compressus Newberry and Worthen 1866
Helodus coniculus Newberry and Worthen 1866
Helodus consolidatus Newberry and Worthen 1866
Helodus crenulatus Newberry and Worthen 1866
Helodus denshumani Newberry and Worthen 1866
Helodus denticulatus Newberry and Worthen 1866
Helodus elytra Newberry and Worthen 1866
Helodus gibbosus Newberry and Worthen 1866
Helodus gibbus Leidy 1857
Helodus laevis Newberry 1879
Helodus limax Newberry and Worthen 1866
Helodus placenta Newberry and Worthen 1866
Helodus politus Newberry and Worthen 1866
Helodus sulcatus Newberry and Worthen 1866
Helodus undulatus Newberry and Worthen 1866
Heptranchias cinereus Gmelin 1789
Herodii
Heteracanthus uddeni Lindahl 1897
Holocephala Bonaparte 1832
Holonema rugosa Claypole 1883
Holonema rugosum Claypole 1883
Holops brevispinis E. D. Cope 1867
Holoptychius granulatus Newberry 1889
Holoptychius granulatus Salter 1861
Holoptychius hallii Newberry 1889
Holoptychius pustulosus Newberry 1889
Holoptychius quebecensis Whiteaves 1889
Holoptychius radiatus Newberry 1889
Holoptychius tuberculatus Newberry 1889
Homacanthus gibbosus Newberry and Worthen 1866
Homacanthus gracilis Whiteaves 1889
Homacanthus rectus Newberry and Worthen 1866
Hoplonchus elegans Davis 1876
Hoplonchus parvulus Newberry 1875
Hoplophoneus crassidens Cragin 1892
Hybocladodus compressus Newberry and Worthen 1866
Hybocladodus intermedius Saint John and Worthen 1875
Hybocladodus nitidus Saint John and Worthen 1875
Hybocladodus plicatilis Saint John and Worthen 1875
Hybocladodus tenuicostatus Saint John and Worthen 1875
Hybodus clarkensis Cragin 1894
Hylerpeton longidentatum Dawson 1876
Hylonomus latidens Dawson 1882
Hylopus hardingi Dawson 1895
Hylopus logani Dawson 1894
Hylopus minor Dawson 1895
Hyotherium platyops Cope 1881
Hyotherium soemereringii von Meyer 1834
Hyphasma Cope 1875
Hyphasma laevis Cope 1875
Ichthyodectes hamatus Cope 1872
Ichthyodectes parvus Stewart 1900
Ichthyodectidnae Crook 1892
Ichthyodectinae Crook 1892
Ichthyodorulites Buckland
Ichthyotomi Cope
Ischyodus fecundus Cope 1875
Ischyodus gaskillii Cope 1875
Ischyodus incrassatus Cope 1875
Ischyodus laterigerus Cope 1869
Ischyodus stenobryus Cope 1875
Ischyodus tripartitus Cope 1875
Ischypterus Egerton 1847
Ischypterus alatus Newberry 1886
Ischypterus braunii Newberry 1888
Ischypterus elegans Newberry 1888
Ischypterus fultus Agassiz 1841
Ischypterus gigas Newberry 1888
Ischypterus lenticularis Newberry 1888
Ischypterus lineatus Newberry 1888
Ischypterus macropterus Newberry 1888
Ischypterus marshii Newberry 1888
Ischypterus micropterus Newberry 1888
Ischypterus minutus Newberry 1888
Ischypterus modestus Newberry 1888
Ischypterus parvus Redfield 1888
Ischypterus robustus Newberry 1888
Isopholidae Hay 1899
Isopholis Zittel 1887
Istiophorus antiquus Leidy 1855
Isurus mantellii Agassiz 1843
Isurus oxyrhynchus Rafinesque 1810
Janassa brevis Newberry 1856
Janassa gurleiana Cope 1877
Janassa ordiana Cope 1881
Janassa strigilina Cope 1881
Lagomorpha Brandt 1885
Lambdodus calceolus Saint John and Worthen 1875
Lambdodus costatus Saint John and Worthen 1875
Lambdodus hamulus Saint John and Worthen 1875
Lambdodus reflexus Saint John and Worthen 1875
Lambdodus transversus Saint John and Worthen 1875
Lamna cornubicus Gmelin 1789
Lamna manitobensis Whiteaves 1889
Lamna quinquelateralis Cragin 1894
Lecracanthus Saint John and Worthen 1875
Lecracanthus unguiculus Saint John and Worthen 1875
Leiodus calcaratus Saint John and Worthen 1875
Leiodus grossipunctatus Saint John and Worthen 1875
Lepisosteus aganus Cope 1877
Lepisosteus cuneatus Cope 1884
Lepisosteus glaber Marsh 1871
Lepisosteus integer Cope 1877
Lepisosteus whitneyi Marsh 1871
Leptichthys Stewart 1899
Leptichthys agilis Stewart 1899
Lestosaurus clidastoides Merriam 1894
Lestosaurus mudgei Cope 1870
Lestosaurus oxyrhinus Merriam 1894
Leuciscus arciferus Cope 1870
Leuciscus bairdii Cope 1870
Leuciscus laminatus Cope 1870
Leuciscus poeticus Cope 1870
Leuciscus reddingi Cope 1883
Leuciscus turneri Lucas 1900
Limnohyus Leidy 1872
Limnopus vagus Marsh 1894
Limnotheriidae Marsh 1875
Liodon perlatus Cope 1869
Liognathus spatulus Newberry 1873
Lisgodus affinis Newberry 1879
Lisgodus curtus Saint John and Worthen 1875
Lisgodus selluliformis Saint John and Worthen 1875
Lisgodus serratus Saint John and Worthen 1875
Loxolophus attenuatus Osborn and Earle 1895
Machaeracanthus major Newberry 1857
Machaeracanthus peracutus Newberry 1857
Machaerodus crassidens Cragin 1892
Machairodus gracilis Cope 1880
Macrepistius arenatus Cope 1894
Macropetalichthys rhapheidolabis Norwood and Owen 1846
Macrosaurus mitchillii DeKay 1830
Mammut brevidens Cope 1889
Mammut chapmani Hays 1834
Mammut euhypodon Cope 1884
Mammut floridanum Leidy 1886
Mammut humboldii Cuvier 1805
Mammut mirificum Leidy 1858
Mammut productum Cope 1874
Mammut rugosidens Leidy 1890
Mammut serridens Cope 1884
Mammut shepardi Leidy 1870
Manta unios Leidy 1876
Marracanthus rectus Newberry and Worthen 1866
Masticura Gill 1872
Mastodon floridanum Leidy 1886
Mastodon mirificum Leidy 1858
Mazodus kepleri Newberry 1889
Mecolepis Newberry 1856
Mecolepis corrugatus Newberry 1856
Mecolepis granulatus Newberry 1856
Mecolepis lineatus Newberry 1856
Mecolepis ornatissimus Newberry 1856
Mecolepis ovoideus Newberry 1856
Mecolepis serratus Newberry 1856
Mecolepis tuberculatus Newberry 1856
Megalichthys anceps Newberry 1888
Megalichthys angustus Newberry 1856
Megalichthys incurvus Newberry 1856
Megalichthys maxillaris Agassiz 1843
Mephitis orthrostica Cope 1896
Merycoidodon hybridus Leidy 1869
Merycoidodon minor Cope 1888
Mesobatis Leidy 1877
Mesobatis eximius Leidy 1855
Mesodmodus explanatus Saint John and Worthen 1875
Mesodmodus exsculptus Saint John and Worthen 1875
Mesodmodus ornatus Saint John and Worthen 1875
Mesoplodon sowerbensis H. M. D. Blainville 1817
Metamosaurus Cope 1878
Metamosaurus fossatus Cope 1878
Microdus laevis Emmons 1857
Mioplosus sauvageanus Cope 1884
Molgophis wheatleyi Cope 1874
Monocladodus clarki Claypole 1893
Monocladodus pinnatus Claypole 1893
Mustela pennantii Erxleben 1777
Myliobatis mordax Leidy 1877
Myliobatis rugosus Leidy 1855
Myliobatis transversalis Gibbes 1850
Mylocyprinus Leidy 1870
Mylocyprinus inflexus Cope 1883
Mylocyprinus robustus Leidy 1870
Mylostoma terrelli Newberry 1883
Mylostoma variabile Newberry 1883
Myomorpha Brandt 1855
Myxophagus Cope 1869
Myxophagus spelaeus Cope 1869
Nanopus caudatus Marsh 1894
Nemorhoedus Smith 1827
Nemorhoedus palmeri Cragin 1899
Notropis Rafinesque 1818
Nummopalatus Roualt 1858
Nummopalatus edwardsius Roualt 1858
Ochotona palatinus Cope 1871
Odontolcae O. C. Marsh 1875
Odontotormae Marsh 1875
Oestocephalus serrula Cope 1871
Oestophorus lilleyi Newberry 1889
Oligobelus Cope 1870
Oligobelus arciferus Cope 1870
Oligobelus laminatus Cope 1870
Oligoplarchus Cope 1891
Onchus clintoni Claypole 1885
Onchus pennsylvanicus Claypole 1885
Onchus rectus Eastman 1899
Oncobatis pentagonus Leidy 1870
Onychodus ortoni Newberry 1889
Oracanthus fragilis Newberry 1857
Oracanthus lineatus Newberry 1897
Oracanthus multiseriatus Newberry 1857
Oracanthus obliquus Saint John and Worthen 1875
Oracanthus rectus Saint John and Worthen 1883
Oracanthus trigonalis Saint John and Worthen 1883
Oracanthus vetustus Leidy 1855
Oricardinus sheareri Cope 1872
Ornithochirus harpygia E. D. Cope 1872
Ornithopappi Stejneger 1885
Orodus alleni Saint John and Worthen 1875
Orodus carinatus Saint John and Worthen 1875
Orodus colletti Newberry 1879
Orodus daedalus Saint John and Worthen 1875
Orodus decussatus Saint John and Worthen 1875
Orodus fastigiatus Saint John and Worthen 1875
Orodus gibbosus Newberry and Worthen 1866
Orodus major Saint John and Worthen 1875
Orodus minusculus Newberry and Worthen 1866
Orodus neglectus Saint John and Worthen 1875
Orodus parallelus Saint John and Worthen 1875
Orodus parvulus Saint John and Worthen 1875
Orodus plicatus Newberry and Worthen 1866
Orodus turgidus Saint John and Worthen 1875
Orodus variabilis Newberry 1875
Orodus varicostatus Saint John and Worthen 1875
Orthacanthus gracilis Newberry 1875
Orthognathus Barkas 1873
Orthognathus reticulosus Barkas 1873
Orthopleurodus angularis J. S. Newberry and A. H. Worthen 1866
Orthopleurodus carbonarius J. S. Newberry and A. H. Worthen 1866
Orthopleurodus convexus Saint John and Worthen 1883
Orthopleurodus novomexicanus Saint John and Worthen 1883
Otodus divaricatus Leidy 1872
Ovibos maximus Richardson 1854
Ovis mamillaris Foster 1837
Oxyrhina spallanzanii Bonaparte 1841
Pachyrhizodus curvatus Loomis 1900
Pachyrhizodus kingii Cope 1872
Pachyrhizodus velox Stewart 1898
Pachyura Gill 1872
Palaeaspis bitruncata Claypole 1884
Palaeaspis elliptica Claypole 1885
Palaechimaera Walcott 1891
Palaechimaera prisca Walcott 1891
Palaedaphus insignis Van Beneden and de Konick 1864
Palaeobatis Leidy 1857
Palaeobatis insignis Leidy 1857
Palaeomeryx kaupii von Meyer 1834
Palaeomylus crassus Newberry 1873
Palaeomylus frangens Newberry 1878
Palaeomylus greenei Newberry 1889
Palaeoniscum antiquum Williams 1886
Palaeoniscum brainerdi Thomas 1853
Palaeoniscum devonicum Clarke 1885
Palaeoniscum macropterum Agassiz 1843
Palaeoniscum reticulatum Williams 1886
Palaeoniscum scutigerum Newberry 1868
Palaeoniscus agassizii Redfield 1841
Palaeoniscus browni Jackson 1851
Palaeoniscus fultus Agassiz 1841
Palaeoniscus gracilis Newberry and Worthen 1870
Palaeoniscus ovatus Redfield 1841
Palaeosauropus antiquior Dawson 1882
Palaeosyops Marsh 1872
Palaeoteuthis marginalis Eichwald 1871
Pantolestoidea Cope 1887
Pantylus coicodus Cope 1896
Pappichthys corsoni E. D. Cope 1873
Parabatrachus Owen 1853
Parabatrachus colei Owen 1853
Parabatrachus maxillaris Agassiz 1843
Paraxonia Marsh 1884
Pareiopliteae Richardson 1836
Paroceras Marsh 1884
Pediocaetes lucasii Shufeldt 1892
Pelion lyellii Wyman 1858
Peltodus plicomphalus Saint John and Worthen 1875
Peltodus pulvinulus Newberry and Worthen 1870
Peltodus quadratus Saint John and Worthen 1875
Peltodus transversus Saint John and Worthen 1875
Percoidea Bleeker 1859
Periplectrodus compressus Saint John and Worthen 1875
Periplectrodus expansus Saint John and Worthen 1875
Periplectrodus warreni Saint John and Worthen 1875
Petalodopsis mirabilis Barkas 1874
Petalodus curtus Newberry and Worthen 1870
Petalodus hastingsiae Owen 1840
Petalodus hybridus Saint John and Worthen 1875
Petalodus knappi Newberry 1879
Petalodus linguifer Newberry and Worthen 1866
Petalodus proximus Saint John and Worthen 1875
Petalorhynchus distortus Saint John and Worthen 1875
Petalorhynchus pseudosagittatus Saint John and Worthen 1875
Petalorhynchus spatulatus Saint John and Worthen 1875
Petalorhynchus striatus Newberry and Worthen 1866
Petrodus acutus Newberry and Worthen 1866
Petrodus pustulosus Newberry and Worthen 1870
Phasganodus dirus Leidy 1857
Phlyctaenacanthus Eastman 1898
Phlyctaenacanthus telleri Eastman 1898
Phlyctaenaspis acadica Whiteaves 1881
Phlyctaenius acadicus Whiteaves 1881
Phoebodus macisaacsii Saint John and Worthen 1875
Phoebodus politus Newberry 1899
Phoebodus springeri Saint John and Worthen 1875
Phoenicopteroidea Stejneger 1885
Phyllodus hipparionyx Eastman 1900
Phyllolepis delicatula Newberry 1889
Physonemus carinatus Saint John and Worthen 1875
Physonemus gigas Newberry and Worthen 1870
Physonemus stellatus Newberry 1889
Phytosaurus rostratus Marsh 1896
Phytosaurus serridens Leidy 1859
Picariae Blanchard 1859
Placodermi M'Coy 1848
Plagiostomata Cuvier
Platyodus lineatus Newberry 1875
Platysomus lacovianus Cope 1891
Platystegos Dawson 1895
Platystegos loricatum Dawson 1895
Platyxystrodus inconditus Saint John and Worthen 1883
Plectospondyli Cope 1872
Pleuracanthides Haeckel 1895
Pleuracanthus biserialis Newberry 1856
Pleuracanthus dilatatus Newberry 1856
Plioplarchus Cope 1883
Plioplarchus whitei Cope 1883
Pneumatosteus Cope 1869
Pnigeacanthus trigonalis Saint John and Worthen 1883
Poecilodus carbonarius Saint John and Worthen 1883
Poecilodus cestriensis Saint John and Worthen 1883
Poecilodus convolutus Newberry and Worthen 1870
Poecilodus sanctiludovici Saint John and Worthen 1883
Poecilodus springeri Saint John and Worthen 1883
Poecilodus varsoviensis Saint John and Worthen 1883
Poecilodus wortheni Saint John 1883
Polymastodontinae E. D. Cope 1884
Polyrhizodus carbonarius Saint John and Worthen 1875
Polyrhizodus dentatus Newberry and Worthen 1866
Polyrhizodus digitatus Leidy 1857
Polyrhizodus excavatus Saint John and Worthen 1866
Polyrhizodus inflexus Newberry and Worthen 1866
Polyrhizodus latus Newberry 1897
Polyrhizodus minimus Saint John and Worthen 1875
Polyrhizodus modestus Newberry 1875
Polyrhizodus nanus Saint John and Worthen 1875
Polyrhizodus piasaensis Saint John and Worthen 1875
Polyrhizodus ponticulus Newberry and Worthen 1866
Polyrhizodus porosus Newberry and Worthen 1866
Polyrhizodus princeps Newberry and Worthen 1866
Polyrhizodus rectus Newberry 1897
Polyrhizodus truncatus Newberry and Worthen 1870
Pomatotherium Geoffroy 1833
Ponerichthys terrelli Miller 1892
Portheus brachygnathus Stewart 1898
Portheus gladius Cope 1878
Portheus lestrio Cope 1873
Portheus lowii Stewart 1898
Pristicladodus springeri Saint John and Worthen 1875
Pristis agassizi Gibbes 1847
Pristis antiquorum Latham 1794
Pristis attenuatus Cope 1869
Pristodus acuminatus Saint John and Worthen 1875
Proballostomus Cope 1891
Prochonias princeps Cope 1869
Prosinopa Trouessart 1897
Prospiraxis major Newberry 1885
Prospiraxis randallii Newberry 1885
Protoreodontinae Scott 1890
Protosphyraena gigas Stewart 1899
Protosphyraena tenuis Loomis 1900
Protosphyraenidae Cope 1892
Protritonidae Nicholson and Lydekker 1889
Psammodus angularis Newberry and Worthen 1866
Psammodus caelatus Saint John and Worthen 1883
Psammodus crassidens Saint John and Worthen 1883
Psammodus glyptus Saint John and Worthen 1883
Psammodus grandis Saint John and Worthen 1883
Psammodus lovianus Saint John and Worthen 1883
Psammodus plenus Saint John and Worthen 1883
Psammodus reticulatus Newberry and Worthen 1866
Psammodus springeri Saint John and Worthen 1883
Psammodus tumidus Saint John and Worthen 1883
Psammodus turgidus Saint John and Worthen 1883
Psephodus crenulatus Newberry and Worthen 1866
Psephodus latus Saint John and Worthen 1883
Psephodus lunulatus Saint John and Worthen 1883
Psephodus obliquus Saint John and Worthen 1883
Psephodus placenta Newberry and Worthen 1866
Psephodus politus Newberry 1897
Psephodus regularis Saint John and Worthen 1883
Psephodus reticulatus Saint John and Worthen 1875
Psephodus symmetricus Saint John and Worthen 1883
Pseudaelurus quadridentata H. M. D. de Blainville 1843
Pseudothryptodus Loomis 1900
Pteraspis acadica Matthew 1886
Pterichthyodes milleri Agassiz 1841
Pterichthys rugosus Claypole 1883
Pternodus springeri Saint John and Worthen 1875
Pteropappi Stejneger 1885
Pterosauri Kaup 1834
Ptychodus anonymus Williston 1900
Ptychodus martini Williston 1900
Ptychodus occidentalis Leidy 1868
Ptychodus papillosus Cope 1875
Ptychodus parvulus Whiteaves 1889
Ptycholepis marshii Newberry 1878
Ptyctodus calceolus Newberry and Worthen 1866
Ptyctodus compressus Eastman 1898
Ptyctodus ferox Eastman 1898
Ptyctodus obliquus Pander 1858
Ptyonius nummifer Cope 1875
Ptyonius pectinatus E. D. Cope 1868
Ptyonius serrula Cope 1871
Ptyonodus Cope 1877
Pycnodus carolinensis Emmons 1858
Pycnodus robustus Leidy 1857
Quebecius quebecensis Whiteaves 1889
Rabdiolepis elegans Emmons 1860
Rajae
Rangifer caribou Gmelin 1788
Raptores Baird 1858
Redfieldius anguilliformis Redfield 1841
Redfieldius minor Newberry 1888
Redfieldius ornatus Newberry 1888
Redfieldius parvulus Redfield 1841
Redfieldius redfieldi Egerton 1847
Rhabdofario lacustris Cope 1870
Rhachitomus Cope 1878
Rhachitomus valens Cope 1878
Rhadinichthys cairnsii Jackson 1851
Rhadinichthys gracilis Newberry and Worthen 1870
Rhadinichthys lineatus Newberry 1856
Rhineastes arcuatus Cope 1873
Rhineastes calvus Cope 1873
Rhineastes pectinatus Cope 1874
Rhineastes radulus Cope 1873
Rhinoptera dubia Leidy 1855
Rhizodopsis granulatus Salter 1861
Rhizodus anceps Newberry 1888
Rhizodus angustus Newberry 1856
Rhizodus incurvus Newberry 1856
Rhizodus quadratus Newberry 1873
Rhizodus reticulatus Newberry and Worthen 1870
Rhynchodus crassus Newberry 1873
Rhynchodus excavatus Newberry 1877
Rhynchodus frangens Newberry 1878
Rhynchodus greenei Newberry 1889
Rhynchodus occidentalis Newberry 1878
Rhynchodus secans Newberry 1873
Rhytina borealis Brandt 1849
Rinodus calceolus Newberry and Worthen 1866
Rutilus Rafinesque 1820
Rutilus condonianus Cope 1883
Rutilus latus Cope 1870
Sagenodus angustus Newberry 1897
Sagenodus dialophus Cope 1878
Sagenodus jugosus Hay 1900
Sagenodus ohioensis Cope 1875
Sagenodus periprion Cope 1878
Sagenodus porrectus Cope 1878
Sagenodus pusillus Cope 1877
Sagenodus quadratus Newberry 1873
Sagenodus reticulatus Newberry and Worthen 1870
Sagenodus serratus Newberry 1875
Sandalodus crassus Newberry and Worthen 1866
Sandalodus elllipticus Newberry 1897
Sandalodus minor Newberry and Worthen 1866
Sandalodus parvulus Newberry and Worthen 1866
Sandalodus rhomboideus Newberry and Worthen 1866
Sarcolemur pygmaeus Cope 1872
Sardinius blackburnii Cope 1891
Saurocephalus broadheadi Stewart 1898
Saurocephalus dentatus Stewart 1898
Saurocephalus ferox Stewart 1898
Saurocephalus leanus Hays 1830
Saurocephalus pygmaeus Loomis 1900
Saurodon ferox Stewart 1898
Saurodon pygmaeus Loomis 1900
Saurodon xiphirostris Stewart 1898
Sauropus Lea 1849
Sauropus antiquior Dawson 1882
Sciaenoidea Gill 1872
Sciuromorpha Brandt 1855
Sciurus calycinus Cope 1871
Sciurus panolius Cope 1869
Scorpaenoidea Garman 1899
Scylliorhininae Gill 1862
Scylliorhinus gracilis Williston 1900
Scylliorhinus planidens Williston 1900
Scylliorhinus rugosus Williston 1900
Scyllium gracilis Williston 1900
Scyllium planidens Williston 1900
Scyllium rugosus Williston 1900
Scymnorhinus lichia Cuvier 1817
Scymnus Cuvier 1817
Scymnus lichia Cuvier 1817
Selacha
Semionotus agassizi Redfield 1841
Semionotus agassizii Redfield 1841
Semionotus alatus Newberry 1886
Semionotus braunii Newberry 1888
Semionotus elegans Newberry 1888
Semionotus fultus Agassiz 1841
Semionotus gigas Newberry 1888
Semionotus lenticularis Newberry 1888
Semionotus lineatus Newberry 1888
Semionotus marshii Newberry 1888
Semionotus micropterus Newberry 1888
Semionotus minutus Newberry 1888
Semionotus modestus Newberry 1888
Semionotus ovatus Redfield 1841
Semionotus parvus Redfield 1888
Semionotus robustus Newberry 1888
Semionotus tenuiceps Agassiz 1843
Semotilus Rafinesque 1820
Semotilus bairdii Cope 1870
Semotilus poeticus Cope 1870
Sicarius extinctus Leidy 1856
Smilerpeton Dawson 1882
Spalacotheriinae Marsh 1887
Spaniodon blondellii Pictet 1850
Sphagepoea Cope 1869
Sphagepoea aciculata Cope 1869
Sphenodon punctata Gray 1842
Sphenodus rectidens Emmons 1858
Sphenophorus Newberry 1889
Sphenophorus lilleyi Newberry 1889
Sphenosaurus Agassiz 1849
Sphyraena major Leidy 1855
Sphyrninae Gill 1872
Spiraxis major Newberry 1885
Spiraxis randallii Newberry 1885
Squali Müller and Henle 1838
Squalius reddingi Cope 1883
Squalus cinereus Gmelin 1789
Squalus cirratus Gmelin 1789
Squalus cornubicus Gmelin 1789
Squalus spinosus Gmelin 1789
Stenacanthus Leidy 1856
Stenacanthus nitida Leidy 1856
Stenognathus corrugatus Newberry 1889
Stenopterodus elongatus Saint John and Worthen 1883
Stenopterodus planus Saint John and Worthen 1883
Stereodectes Cope 1869
Stereodectes tortus Cope 1869
Stratodus oxypogon Cope 1877
Strepsodus arenosus Hay 1900
Strepsodus dawsoni Hay 1900
Strigilina gurleiana Cope 1877
Suchoprion sulcidens E. D. Cope 1878
Syllaemus Cope 1875
Syllaemus latifrons Cope 1875
Synconodon sexcuspis Osborn 1898
Syntegmodus Loomis 1900
Syntegmodus altus Loomis 1900
Synthetodus trisulcatus Eastman 1896
Taeniodus obliquus Saint John and Worthen 1883
Taeniodus regularis Saint John and Worthen 1883
Tamias laevidens Cope 1869
Tanaodus angularis Newberry and Worthen 1866
Tanaodus bellcinctus Saint John and Worthen 1875
Tanaodus depressus Saint John and Worthen 1875
Tanaodus gracillimus Newberry and Worthen 1866
Tanaodus grossiplicatus Saint John and Worthen 1875
Tanaodus multiplicatus Newberry and Worthen 1866
Tanaodus obscurus Leidy 1857
Tanaodus polymorphus Saint John and Worthen 1875
Tanaodus praenuntius Saint John and Worthen 1875
Tanaodus pumilis Saint John and Worthen 1875
Tanaodus sculptus Saint John and Worthen 1875
Tanaodus sublunatus Saint John and Worthen 1875
Tayassu pennsylvanicus Leidy 1889
Tayassu tetragonus Cope 1899
Tegeolepis clarkii Newberry 1888
Teleopternus Cope 1899
Teleostomi Bonaparte 1836
Telmatherium hyognathum Osborn 1889
Thinopus Marsh 1896
Thinopus antiquus Marsh 1896
Thinotherium Marsh 1872
Thomomys bulbivorus Richardson 1829
Thomomys clusius Coues 1875
Thrinacodus bicornis Newberry 1879
Thrinacodus duplicatus Newberry and Worthen 1866
Thryptodus rotundus Loomis 1900
Thryptodus zitteli Loomis 1900
Thyrsidium Cope 1875
Tinoceras speirianum Osborn 1881
Tinodontinae Marsh 1887
Titanichthys agassizii Newberry 1885
Titanichthys attenuatus Wright 1893
Titanichthys brevis Claypole 1896
Titanichthys clarkii Newberry 1887
Titanichthys rectus Claypole 1893
Tomiopsis Cope 1893
Trachosteus clarkii Newberry 1889
Triaenaspis Cope 1878
Trigonodus minor Newberry and Worthen 1866
Tristychius fimbriatus Stock 1883
Trygon carolinensis Emmons 1858
Trygon hastata De Kay 1842
Turseodus acutus Leidy 1857
Tylosaurus micromus Marsh 1872
Tylosaurus perlatus Cope 1869
Typodus annulatus Quenstedt 1858
Uranoplosus Sauvage 1879
Uranoplosus arctatus Cope 1894
Uranoplosus cotteaui Sauvage 1897
Vaticinodus carbonarius Saint John and Worthen 1883
Vaticinodus discrepans Saint John and Worthen 1883
Vaticinodus lepis Saint John and Worthen 1883
Vaticinodus similis Saint John and Worthen 1883
Vaticinodus simplex Saint John and Worthen 1883
Vaticinodus vetustus Saint John and Worthen 1883
Venustodus robustus Saint John and Worthen 1875
Venustodus tenuicristatus Saint John and Worthen 1875
Venustodus variabilis Saint John and Worthen 1875
Venustodus venustus Leidy 1857
Viverravus leptomylus Cope 1880
Viverravus protenus Cope 1874
Vulpes latidentatus Cope 1899
Xema sabinii Sabine 1819
Xiphactinus brachygnathus Stewart 1898
Xiphias antiquus Leidy 1855
Xystracanthus acinaciformis Saint John and Worthen 1875
Xystracanthus anceps Newberry and Worthen 1866
Xystracanthus gemmatus Newberry and Worthen 1866
Xystracanthus mirabilis Saint John and Worthen 1875
Xystracanthus reversus Saint John and Worthen 1875
Xystrodus inconditus Saint John and Worthen 1883
Zapodinae Coues 1875