Classification of O'Keefe and Street 2009

Superfm. †Plesiosauroidea Welles 1943
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Fm. †Elasmosauridae Cope 1869 [elasmosaur]
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G. †Cimoliasaurus Leidy 1851
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†Cimoliasaurus magnus Leidy 1851
Invalid names: Cimoliasauridae Delair 1959 [synonym]
Unr. †Tricleidia O'Keefe 2001
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Invalid names: Aristonectidae O'Keefe and Street 2009 [empty]