- Роды incertae sedis
- Alexeyisaurus Sennikov & Arkhangelsky, 2010[4]
- Callawayasaurus Carpenter, 1999
- Callowayosaurus
- Cardiocorax Araújo et al., 2015
- Cimoliasaurus Leidy, 1851
- Eromangasaurus Kear, 2005
- Gronausaurus Hampe, 2013
- Hydrotherosaurus Welles, 1943
- Kawanectes O'Gorman, 2016
- Leurospondylus Brown, 1913
- Libonectes Carpenter, 1997
- Mauisaurus Hector, 1874
- Scanisaurus Persson, 1960
- Stereosaurus Seeley, 1869
- Thalassiosaurus Welles, 1943
- Thalassomedon Welles, 1943
- Thalassonomosaurus Welles, 1943
- Tuarangisaurus Wiffen & Moisley 1986
- Vegasaurus O'Gorman et al., 2015
- Wapuskanectes Druckenmiller & Russell, 2006
- Zarafasaura Vincent et al., 2011
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- Подсемейство Alzadasaurinae
- Подсемейство Aristonectinae Otero et al., 2012
- Подсемейство Styxosaurinae Otero, 2016
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