Classification of Welles 1943

Or. †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. †Alzadasaurus Welles 1943
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†Alzadasaurus riggsi Welles 1943
G. †Aphrosaurus Welles 1943
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†Aphrosaurus furlongi Welles 1943
G. †Elasmosaurus Cope 1868
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Invalid names: Discosaurus carinatus Cope 1868 [objective synonym]
G. †Fresnosaurus Welles 1943
G. †Hydralmosaurus Welles 1943
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G. †Hydrotherosaurus Welles 1943
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G. †Leurospondylus Brown 1913
G. †Morenosaurus Welles 1943
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†Morenosaurus stocki Welles 1943
G. †Styxosaurus Welles 1943
G. †Thalassiosaurus Welles 1943
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†Thalassiosaurus ischiadicus Williston 1903
G. †Thalassomedon Welles 1943
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G. †Thalassonomosaurus Welles 1943
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†Thalassonomosaurus marshii Williston 1906
†Thalassonomosaurus nobilis Williston 1906
Invalid names: Elasmosaurus sternbergi Williston 1906 [nomen dubium]
Fm. †Plesiosauridae Gray 1825
Superfm. †Pliosauroidea Welles 1943
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Fm. †Pliosauridae Seeley 1874
Fm. †Polycotylidae Williston 1908
Invalid names: Cimoliasaurus magnus Leidy 1851 [nomen dubium]
Invalid names: Brimosaurus Leidy 1854 [nomen dubium], Brimosaurus grandis Leidy 1855 [nomen dubium], Cimoliasaurus Leidy 1851 [nomen dubium]