Classification of Benson and Druckenmiller 2014
Unr. †Pistosauria Baur 1890
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G. †Augustasaurus Sander 1997
G. †Bobosaurus Dalla Vecchia 2006
G. †Pistosaurus Meyer 1839
Unr. †Plesiosauria de Blainville 1835 [plesiosaur]
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G. †Eoplesiosaurus Benson et al. 2012
G. †Eretmosaurus Seeley 1874
Superfm. †Plesiosauroidea Welles 1943
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Unr. †Cryptoclidia Ketchum and Benson 2010
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Fm. †Cryptoclididae Williston 1925
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G. †Abyssosaurus Berezin 2011
G. †Colymbosaurus Seeley 1874
G. †Cryptoclidus Seeley 1892
G. †Djupedalia Knutsen et al. 2012
G. †Kimmerosaurus Brown 1981
G. †Muraenosaurus Seeley 1874
G. †Pantosaurus Marsh 1893
G. †Spitrasaurus Knutsen et al. 2012
G. †Tatenectes O'Keefe and Wahl, Jr. 2003
G. †Tricleidus Andrews 1909
Invalid names: Xenopsaria Benson and Druckenmiller 2014 [empty]
G. †Plesiopterys O'Keefe 2004
G. †Plesiosaurus de la Beche and Conybeare 1821
G. †Westphaliasaurus Schwermann and Sander 2011
Fm. †Pliosauridae Seeley 1874
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G. †Attenborosaurus Bakker 1993
G. †Hauffiosaurus O'Keefe 2001
G. †Marmornectes Ketchum and Benson 2011
G. †Thalassiodracon Storrs and Taylor 1996
Unr. †Thalassophonea Benson and Druckenmiller 2014
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Subfm. †Brachaucheninae Williston 1925
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G. †Brachauchenius Williston 1903
G. †Kronosaurus Longman 1924
G. †Megacephalosaurus Schumacher et al. 2013
G. †Gallardosaurus Gasparini 2009
G. †Liopleurodon Sauvage 1873
G. †Peloneustes Lydekker 1889
G. †Pliosaurus Owen 1841
G. †Simolestes Andrews 1909
Fm. †Rhomaleosauridae Nopcsa 1928
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G. †Anningasaura Vincent and Benson 2012
G. †Archaeonectrus Novozhilov 1964
G. †Avalonnectes Benson et al. 2012
G. †Borealonectes Sato and Wu 2008
G. †Maresaurus Gasparini 1997
G. †Meyerasaurus Smith and Vincent 2010
G. †Rhomaleosaurus Seeley 1874
G. †Stratesaurus Benson et al. 2012
G. †Yunguisaurus Cheng et al. 2006