Classification of Ketchum and Benson 2011

Or. †Plesiosauria de Blainville 1835 [plesiosaur]
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Superfm. †Plesiosauroidea Welles 1943
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Unr. †Cryptoclidia Ketchum and Benson 2010
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Fm. †Cryptoclididae Williston 1925
Unr. †Leptocleidia Ketchum and Benson 2010
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Fm. †Leptocleididae White 1940
Fm. †Polycotylidae Williston 1908
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G. †Thililua Bardet et al. 2003
Fm. †Elasmosauridae Cope 1869 [elasmosaur]
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G. †Kaiwhekea Cruickshank and Fordyce 2002
Fm. †Plesiosauridae Gray 1825
Superfm. †Pliosauroidea Welles 1943
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Fm. †Pliosauridae Seeley 1874
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G. †Attenborosaurus Bakker 1993
G. †Brachauchenius Williston 1903
G. †Hauffiosaurus O'Keefe 2001
G. †Kronosaurus Longman 1924
G. †Liopleurodon Sauvage 1873
G. †Marmornectes Ketchum and Benson 2011
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†Marmornectes candrewi Ketchum and Benson 2011
G. †Peloneustes Lydekker 1889
G. †Pliosaurus Owen 1841
G. †Simolestes Andrews 1909
G. †Thalassiodracon Storrs and Taylor 1996
Fm. †Rhomaleosauridae Nopcsa 1928
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G. †Archaeonectrus Novozhilov 1964
G. †Eurycleidus Andrews 1922