Classification of O'Gorman et al. 2013

Unr. †Sauropterygia Owen 1859
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Unr. †Plesiosauria de Blainville 1835 [plesiosaur]
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Superfm. †Plesiosauroidea Welles 1943
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Fm. †Elasmosauridae Cope 1869 [elasmosaur]
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G. †Aristonectes Cabrera 1941
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†Aristonectes parvidens Cabrera 1941