Classification of Gasparini and Spalletti 1993

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. †Cryptoclidus Seeley 1892
Fm. †Elasmosauridae Cope 1869 [elasmosaur]
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G. †Muraenosaurus Seeley 1874
Superfm. †Pliosauroidea Welles 1943
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Fm. †Pliosauridae Seeley 1874