Classification of Gasparini et al. 2001

Superfm. †Plesiosauroidea Welles 1943
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Fm. †Elasmosauridae Cope 1869 [elasmosaur]
Fm. †Polycotylidae Williston 1908
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G. †Sulcusuchus Gasparini and Spalletti 1990
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Sulcusuchus erraini Gasparini and Spalletti 1990