Reptilia Laurenti, 1768
Aphrosaurus Welles, 1943
Brancasaurus Wegner, 1914
Callawayasaurus Carpenter, 1999
Callowayosaurus
Discosaurus Leidy, 1851
Elasmosaurus Cope, 1868
Hydralmosaurus Welles, 1943
Hydrorion
Hydrotherosaurus Welles, 1943
Leurospondylus Brown, 1914
Libonectes Carpenter, 1997
Mauisaurus Hector, 1874
Morenosaurus Welles, 1943
Muraenosaurus Seeley, 1874
Occitanosaurus Bardet, Godefroit & Sciau, 1999
Styxosaurus Welles, 1943
Terminonatator Sato, 2003
Thalassomedon Welles, 1943
Tuarangisaurus Wiffen & Moisley, 1986
Woolungasaurus Persson, 1960
