Classification of Brown 1981

Cl. Reptilia Laurenti 1768 [reptile]
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Subcl. †Sauropterygia Owen 1859
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Or. †Plesiosauria de Blainville 1835 [plesiosaur]
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Superfm. †Plesiosauroidea Welles 1943
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Fm. †Cryptoclididae Williston 1925
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G. †Aristonectes Cabrera 1941
G. †Cryptoclidus Seeley 1892
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†Cryptoclidus eurymerus Phillips 1871
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Invalid names: Apractocleidus teretipes Smellie 1915 [synonym], Cryptoclidus platymerus Seeley 1892 [synonym], Plesiosaurus durobrivensis Seeley 1892 [synonym]
†Cryptoclidus richardsoni Lydekker 1889
Invalid names: Apractocleidus Smellie 1915 [objective synonym], Plesiosaurus oxfordiensis Seeley 1869 [nomen nudum], Plesiosaurus oxoniensis Phillips 1871 [nomen dubium]
G. †Kimmerosaurus Brown 1981
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†Kimmerosaurus langhami Brown 1981
Fm. †Elasmosauridae Cope 1869 [elasmosaur]
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G. †Colymbosaurus Seeley 1874
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Invalid names: Colymbosaurus megadeirus Seeley 1869 [synonym], Plesiosaurus manselii Hulke 1870 [synonym], Pliosaurus portlandicus Owen 1869 [synonym]
G. †Elasmosaurus Cope 1868
G. †Muraenosaurus Seeley 1874
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†Muraenosaurus beloclis Seeley 1892
†Muraenosaurus leedsii Seeley 1874
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Invalid names: Cimoliosaurus plicatus Phillips 1871 [synonym], Muraenosaurus leedsi Seeley 1874 [misspelling], Muraenosaurus platyclis Seeley 1892 [synonym], Muraenosaurus plicatus Phillips 1871 [synonym], Tremamesacleis durobrivensis Lydekker 1889 [synonym]
Invalid names: Picrocleidus Andrews 1909 [synonym], Tremamesacleis White 1940 [synonym]
G. †Tricleidus Andrews 1909
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†Tricleidus seeleyi Andrews 1909
Fm. †Plesiosauridae Gray 1825
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G. †Plesiosaurus de la Beche and Conybeare 1821
G. †Sthenarosaurus Watson 1909
Superfm. †Pliosauroidea Welles 1943
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Fm. †Pliosauridae Seeley 1874
Invalid names: Plesiosaurus affinis Owen 1840 [nomen dubium], Plesiosaurus brachistospondylus Hulke 1870 [nomen dubium], Plesiosaurus brevis Owen 1854 [nomen dubium], Plesiosaurus ellipsospondylus Phillips 1871 [nomen dubium], Plesiosaurus hexagonalis Phillips 1871 [nomen dubium], Plesiosaurus infraplanus Phillips 1871 [nomen dubium], Plesiosaurus levis Owen 1854 [nomen dubium], Plesiosaurus megapleuron Owen 1854 [nomen dubium], Plesiosaurus phillipsi Sauvage 1871 [nomen dubium], Plesiosaurus planispondylus Damon 1860 [nomen nudum], Plesiosaurus subdepressus Owen 1854 [nomen nudum], Plesiosaurus truncatus Owen 1854 [nomen dubium], Plesiosaurus validus Phillips 1871 [nomen dubium], Plesiosaurus winspitensis Seeley 1871 [nomen dubium]
Invalid names: Plesiosaurus doedicomus Owen 1840 [nomen dubium]
G. †Cimoliasaurus Leidy 1851
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Invalid names: Cimoliasaurus brevior Lydekker 1889 [nomen dubium], Cimoliosaurus Leidy 1851 [misspelling]
†Cimoliasaurus durobrivensis Lydekker 1889
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Invalid names: Cimoliosaurus durobrivensis Lydekker 1889 [misspelling]
†Plesiosaurus megadeirus Seeley 1869
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Invalid names: Plesiosaurus megadirus Seeley 1869 [misspelling]