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†unranked clade Plesiosauria de Blainville 1835 (plesiosaur)

Reptilia - Sauropterygia

Invalid subtaxa: Cimoliasaurus latispinus Owen 1854 [nomen vanum], Cimoliasaurus orientalis Cope 1869 [nomen vanum], Cimoliasaurus planior Leidy 1870 [nomen vanum], Cimoliasaurus vetustus Leidy 1851 [nomen vanum], Cimoliosaurus australis Owen 1861 [nomen vanum], Cimoliosaurus bernardi Owen 1850 [nomen vanum], Cimoliosaurus latispinus Owen 1854 [nomen vanum], Cimoliosaurus neocomiensis Campiche 1860 [nomen vanum], Cimoliosaurus smithi Owen 1884 [nomen vanum], Cimoliosaurus truncatus Owen 1854 [nomen dubium], Crymocetus barnardi Owen 1850 [nomen vanum], Discosaurus orientalis Cope 1869 [nomen vanum], Discosaurus planior Leidy 1870 [nomen vanum], Discosaurus vetustus Leidy 1851 [nomen vanum], Elasmosaurus orientalis Cope 1869 [nomen vanum], Muraenosaurus truncatus Owen 1854 [nomen dubium], Peloneustes kanzleri Koken 1905 [nomen vanum], Piptomerus microporus Cope 1887 [nomen vanum], Plesiosaurus affinis Owen 1840 [nomen dubium], Plesiosaurus australis Owen 1861 [nomen vanum], Plesiosaurus bernardi Owen 1850 [nomen vanum], Plesiosaurus brevis Owen 1854 [nomen dubium], Plesiosaurus carinatus Phillips 1871 [replaced name], Plesiosaurus continuus Owen 1841 [nomen vanum], Plesiosaurus cycnodeirus Seeley 1869 [nomen nudum], Plesiosaurus degenhardti Koken 1887 [nomen vanum], Plesiosaurus gouldii Williston 1897 [nomen vanum], Plesiosaurus infraplanus Phillips 1871 [nomen dubium], Plesiosaurus kanzleri Koken 1905 [nomen vanum], Plesiosaurus latispinus Owen 1854 [nomen vanum], Plesiosaurus levis Owen 1854 [nomen dubium], Plesiosaurus lockwoodii Cope 1869 [nomen vanum], Plesiosaurus microdeirus Seeley 1869 [nomen nudum], Plesiosaurus neocomiensis Campiche 1860 [nomen vanum], Plesiosaurus nordmanni Eichwald 1869 [nomen vanum], Plesiosaurus pachyomus Owen 1840 [nomen vanum], Plesiosaurus phillipsi Sauvage 1871 [nomen dubium], Plesiosaurus planus trigonalis Owen 1864 [nomen vanum], Plesiosaurus platydeirus Seeley 1869 [nomen nudum], Plesiosaurus shirleyensis Knight 1900 [nomen dubium], Plesiosaurus smithi Owen 1884 [nomen vanum], Plesiosaurus smithii Owen 1884 [nomen vanum], Plesiosaurus truncatus Owen 1854 [nomen dubium], Plesiosaurus validus Phillips 1871 [nomen dubium], Polyptychodon Owen 1841 [nomen vanum], Polyptychodon continuus Owen 1841 [nomen vanum], Stereosaurus cratynotus Seeley 1869 [nomen nudum], Taphrosaurus lockwoodii Cope 1869 [nomen vanum]

Parent taxon: Pistosauria according to R. B. J. Benson and P. S. Druckenmiller 2013

Sister taxa: Augustasaurus, Pistosauridae, Pistosaurus

Subtaxa: Aptychodon, Aptychodon cretaceus, Bathyspondylus, Bobosaurus, Cimoliasaurus lissaensis, Cimoliasaurus teplicensis, Cimoliosaurus nazarowi, Elasmosaurus intermedius, Embaphias, Embaphias circulosus, Eoplesiosaurus, Eretmosaurus, Gymocetus, Hexatarsostinus, Hunosaurus, Hunosaurus fasseli, Iserosaurus, Iserosaurus littoralis, Lutkesaurus, Mauisaurus brachiolatus, Muraenosauridae, Namuncurania, Neoplesiosauria, Nothosaurops, Oligosimus grandaevus, Orophosaurus, Orophosaurus pauciporus, Piptomerus hexagonus, Piptomerus megaloporus, Piratosaurus plicatus, Plesiosauroidea, Plesiosaurus balticus, Plesiosaurus brachistospondylus, Plesiosaurus brevifemur, Plesiosaurus ellipsospondylus, Plesiosaurus euryspondylus, Plesiosaurus hexagonalis, Plesiosaurus megapleuron, Plesiosaurus mudgei, Plesiosaurus ophiodeirus, Plesiosaurus planispondylus, Plesiosaurus planus, Plesiosaurus poecilospondylus, Plesiosaurus subdepressus, Plesiosaurus traversii, Plesiosaurus winspitensis, Pliosauridae, Pliosauroidea, Pliosaurus planus, Polycotylus donicus, Polycotylus epigurgitis, Polycotylus orientalis, Polycotylus tenuis, Polycotylus ultimus, Polyptychodon hudsoni, Polyptychodon interruptus, Polyptychodon neocomiensis, Polyptychodon patagonicus, Rhomaleosauridae, Scarrisaurus, Stereosaurus platyomus, Stereosaurus stenomus, Stratesaurus, Sulmosaurus, Taphrosaurus, Tremamesacleididae, Uronautes, Uronautes cetiformis

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Ecology: aquatic carnivore