Classification of Otero et al. 2012
Or. †Plesiosauria de Blainville 1835 [plesiosaur]
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G. †Brancasaurus Wegner 1914
Superfm. †Cryptocleidoidea Williston 1925
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G. †Cryptoclidus Seeley 1892
G. †Dolichorhynchops Williston 1902
G. †Edgarosaurus Druckenmiller 2002
G. †Kimmerosaurus Brown 1981
G. †Muraenosaurus Seeley 1874
G. †Polycotylus Cope 1869
G. †Tatenectes O'Keefe and Wahl, Jr. 2003
G. †Tricleidus Andrews 1909
G. †Trinacromerum Cragin 1888
G. †Occitanosaurus Bardet et al. 1999
G. †Thalassiodracon Storrs and Taylor 1996
Fm. †Elasmosauridae Cope 1869 [elasmosaur]
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Unr. †Aristonectinae Otero et al. 2012
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G. †Aristonectes Cabrera 1941
G. †Futabasaurus Sato et al. 2006
G. †Kaiwhekea Cruickshank and Fordyce 2002
G. †Callawayasaurus Carpenter 1999
G. †Mauisaurus Hector 1874
G. †Styxosaurus Welles 1943
G. †Thalassomedon Welles 1943
G. †Tuarangisaurus Wiffen and Moisley 1986