Classification of Schumacher and Everhart 2005

Or. †Plesiosauria de Blainville 1835 [plesiosaur]
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Superfm. †Plesiosauroidea Welles 1943
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Fm. †Elasmosauridae Cope 1869 [elasmosaur]
Superfm. †Pliosauroidea Welles 1943
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Fm. †Pliosauridae Seeley 1874
Fm. †Polycotylidae Williston 1908
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G. †Trinacromerum Cragin 1888