Classification of Persson 1963
G. †Elasmosaurus Cope 1868
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†Elasmosaurus kurskensis Bogolubov 1911
†Elasmosaurus orskensis Bogolubov 1911
†Elasmosaurus serdobensis Bogolubov 1911
G. †Muraenosaurus Seeley 1874
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†Muraenosaurus elasmosauroides Bogolubov 1911
†Muraenosaurus fahrenkohli Waldheim 1846
†Muraenosaurus purbecki Bogolubov 1911
G. †Polycotylus Cope 1869
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†Polycotylus brevispondylus Bogolubov 1911
†Polycotylus epigurgitis Bogolubov 1911
†Polycotylus orientalis Bogolubov 1911
†Polycotylus ultimus Bogolubov 1911
G. †Rhomaleosaurus Seeley 1874
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†Rhomaleosaurus costatus Owen 1840
†Rhomaleosaurus hawkinsi Owen 1840
†Rhomaleosaurus macrocephalus Owen 1840
†Rhomaleosaurus rostratus Owen 1865
Or. Crocodylia Owen 1842 [crocodilian]
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Invalid names: Pliosaurus phosphaticus Stefano 1903 [nomen dubium]
Subor. †Plesiosauria de Blainville 1835 [plesiosaur]
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Superfm. †Plesiosauroidea Welles 1943
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Fm. †Cimoliasauridae Delair 1959
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G. †Cimoliasaurus Leidy 1851
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†Cimoliasaurus magnus Leidy 1851
Invalid names: Brimosaurus grandis Leidy 1855 [nomen dubium]
Invalid names: Brimosaurus Leidy 1854 [nomen dubium]
Fm. †Elasmosauridae Cope 1869 [elasmosaur]
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G. †Brancasaurus Wegner 1914
G. †Mauisaurus Hector 1874
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†Mauisaurus gardneri Seeley 1878
†Mauisaurus haasti Hector 1874
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Invalid names: Plesiosaurus holmesi Hector 1874 [synonym], Plesiosaurus hoodi Owen 1870 [synonym]
G. †Woolungasaurus Persson 1960
Invalid names: Brancasauridae White 1940 [synonym], Elasmosaurus constrictus Owen 1850 [nomen dubium], Plesiosaurus mauretanicus Arambourg 1952 [nomen dubium]
Fm. †Plesiosauridae Gray 1825
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G. †Cryptocleidus Seeley 1892
G. †Plesiosaurus de la Beche and Conybeare 1821
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†Plesiosaurus brachypterygius Huene 1923
†Plesiosaurus dolichodeirus Conybeare 1824
†Plesiosaurus guilelmiimperatoris Dames 1895
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Invalid names: Seeleyosaurus holzmadensis White 1940 [synonym]
Superfm. †Pliosauroidea Welles 1943
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Fm. †Pliosauridae Seeley 1874
Fm. †Polycotylidae Williston 1908
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G. †Brachauchenius Williston 1903
Invalid names: Brachaucheniidae Williston 1925 [synonym], Pliosaurus chilensis Gay 1848 [nomen dubium]
Fm. †Rhomaleosauridae Nopcsa 1928
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G. †Eretmosaurus Seeley 1874
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†Eretmosaurus dubius Tate and Blake 1876
†Eretmosaurus rugosus Owen 1840
G. †Leptocleidus Andrews 1922
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†Leptocleidus capensis Andrews 1911
†Leptocleidus superstes Andrews 1922
Invalid names: Peyerus Stromer 1935 [synonym]
Invalid names: Thaumatosauridae Romer 1956 [synonym]
Invalid names: Brachydeira Seeley 1892 [synonym]
†Plesiosaurus bernardi Owen 1850
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Invalid names: Cimoliasaurus cantabrigiensis Lydekker 1889 [synonym]
†Polycotylus ichthyospondylus Seeley 1869
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†Polycotylus ichthyospondylus tanais Bogolubov 1911