Classification of Carpenter 1999

Or. †Plesiosauria de Blainville 1835 [plesiosaur]
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Fm. †Cryptoclididae Williston 1925
Superfm. †Plesiosauroidea Welles 1943
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Fm. †Elasmosauridae Cope 1869 [elasmosaur]
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G. †Brancasaurus Wegner 1914
G. †Callawayasaurus Carpenter 1999
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G. †Elasmosaurus Cope 1868
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G. †Hydralmosaurus Welles 1943
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Invalid names: Styxosaurus browni Welles 1952 [synonym]
G. †Hydrotherosaurus Welles 1943
G. †Libonectes Carpenter 1997 [southwest diver]
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†Libonectes morgani Welles 1949
G. †Microcleidus Watson 1909
G. †Styxosaurus Welles 1943
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†Styxosaurus snowii Williston 1890
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Invalid names: Alzadasaurus kansasensis Welles 1952 [synonym], Alzadasaurus pembertoni Welles and Bump 1949 [synonym], Thalassiosaurus ischiadicus Williston 1903 [synonym], Thalassonomosaurus marshi Williston 1906 [synonym]
Invalid names: Thalassiosaurus Welles 1943 [synonym], Thalassonomosaurus Welles 1943 [synonym]
G. †Thalassomedon Welles 1943
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Invalid names: Alzadasaurus riggsi Welles 1943 [synonym]
Invalid names: Alzadasaurus Welles 1943 [synonym]
G. †Tuarangisaurus Wiffen and Moisley 1986
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†Tuarangisaurus keyesi Wiffen and Moisley 1986
G. †Muraenosaurus Seeley 1874
Fm. †Plesiosauridae Gray 1825
G. †Morenosaurus Welles 1943
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†Morenosaurus stocki Welles 1943
Fm. †Pliosauridae Seeley 1874
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G. †Plesiopleurodon Carpenter 1996