Opinions from R. Motani 1999
- 'Besanosaurus belongs to Shastasauridae'
- 'Brachypterygius belongs to Ophthalmosauria'
- 'Brachypterygius zhuravlevi belongs to Brachypterygius' according to Arkhangelsky 1998
- 'Californosaurus belongs to Euichthyosauria'
- 'Californosaurus perrini belongs to Californosaurus' according to Merriam 1903
- 'Caypullisaurus belongs to Ophthalmosauria'
- 'Chacaicosaurus belongs to Thunnosauria'
- 'Chaosaurus is a misspelling of Chaohusaurus'
- 'Chaohusaurus belongs to Grippidia'
- 'Chaohusaurus geishanensis belongs to Chaohusaurus' according to Young and Dong 1972
- 'Cymbospondylus belongs to Ichthyosauria'
- 'Cymbospondylus buchseri belongs to Cymbospondylus'
- 'Cymbospondylus petrinus belongs to Cymbospondylus' according to Leidy 1868
- 'Cymbospondylus petrinus belongs to Cymbospondylus'
- 'Eoichthyosauria belongs to Ichthyopterygia'
- 'Euichthyosauria belongs to Merriamosauria'
- 'Eurhinosauria belongs to Parvipelvia'
- 'Eurhinosaurus belongs to Eurhinosauria'
- 'Excalibosaurus belongs to Eurhinosauria'
- 'Excalibosaurus costini belongs to Excalibosaurus'
- 'Grendelius mordax is recombined as Brachypterygius mordax' according to McGowan 1976
- 'Grippia belongs to Grippidia'
- 'Grippidae was reranked as the unranked clade Grippidia and belongs to Eoichthyosauria'
- 'Hudsonelpidia belongs to Parvipelvia'
- 'Hudsonelpidia brevirostris belongs to Hudsonelpidia' according to C. McGowan 1995
- 'Ichthyopterygia belongs to Diapsida'
- 'Ichthyosauria was reranked as a unranked clade and belongs to Eoichthyosauria'
- 'Ichthyosaurus belongs to Thunnosauria'
- 'Ichthyosaurus acutirostris is recombined as Stenopterygius acutirostris' according to Owen 1881
- 'Ichthyosaurus atavus is recombined as Mixosaurus atavus'
- 'Ichthyosaurus breviceps belongs to Ichthyosaurus' according to Owen 1888
- 'Ichthyosaurus conybeari belongs to Ichthyosaurus' according to Lydekker 1888
- 'Ichthyosaurus cornalianus is recombined as Mixosaurus cornalianus'
- 'Ichthyosaurus enthekiodon [misspelled as Ichthyosaurus entheciodon] belongs to Ichthyosaurus' according to Lydekker 1889
- 'Ichthyosaurus hercynicus is recombined as Platypterygius hercynicus' according to Kuhn 1946
- 'Ichthyosaurus janiceps belongs to Ichthyosaurus' according to C. McGowan 1996
- 'Ichthyosaurus janiceps is recombined as Macgowania janiceps'
- 'Ichthyosaurus longipes is recombined as Stenopterygius longipes'
- 'Leptonectes belongs to Eurhinosauria'
- 'Macgowania belongs to Parvipelvia'
- 'Merriamosauria belongs to Ichthyosauria'
- 'Mikadocephalus gracilirostris belongs to Mikadocephalus' according to Maisch and Matzke 1997
- 'Mixosauria belongs to Ichthyosauria'
- 'Mixosaurus belongs to Mixosauria'
- 'Mixosaurus maotaiensis is a nomen dubium'
- 'Mixosaurus nordenskioeldi belongs to Mixosaurus'
- 'Myopterygius americanus is recombined as Platypterygius americanus' according to Nace 1939
- 'Nannopterygius belongs to Ophthalmosauria'
- 'Ophthalmosauridae was reranked as the unranked clade Ophthalmosauria and belongs to Thunnosauria'
- 'Ophthalmosaurus belongs to Ophthalmosauria'
- 'Ophthalmosaurus discus belongs to Ophthalmosaurus' according to Marsh 1879
- 'Ophthalmosaurus icenicus belongs to Ophthalmosaurus' according to Seeley 1874
- 'Otschevia belongs to Ophthalmosauria'
- 'Paraophthalmosaurus belongs to Ophthalmosauria'
- 'Paraophthalmosaurus saratoviensis belongs to Paraophthalmosaurus' according to Arkhangelsky 1998
- 'Paraophthalmosaurus saveljeviensis belongs to Paraophthalmosaurus'
- 'Parvinatator belongs to Ichthyopterygia'
- 'Parvinatator wapitiensis belongs to Parvinatator' according to Nicholls and Brinkman 1995
- 'Parvipelvia belongs to Euichthyosauria'
- 'Pessopteryx arctica belongs to Pessopteryx' according to Wiman 1910
- 'Pessopteryx arctica is a nomen dubium'
- 'Pessopteryx minor belongs to Pessopteryx' according to Wiman 1910
- 'Pessopteryx minor is recombined as Isfjordosaurus minor'
- 'Pessopteryx nisseri belongs to Pessopteryx' according to Wiman 1910
- 'Pessopteryx pinguis belongs to Pessopteryx' according to Wiman 1910
- 'Pessopteryx pinguis is a nomen dubium'
- 'Platypterygius belongs to Ophthalmosauria'
- 'Platypterygius compylodon belongs to Platypterygius' according to Carter 1846
- 'Platypterygius kiprijanoffi belongs to Platypterygius' according to Romer 1968
- 'Platypterygius longmani belongs to Platypterygius' according to Wade 1990
- 'Plutoniosaurus belongs to Ophthalmosauria'
- 'Plutoniosaurus bedengensis belongs to Plutoniosaurus' according to Efimov 1997
- 'Shastasauria belongs to Merriamosauria'
- 'Shastasauridae belongs to Shastasauria'
- 'Shastasaurinae belongs to Shastasauridae'
- 'Shastasaurus belongs to Shastasaurinae'
- 'Shastasaurus careyi is a nomen dubium'
- 'Shastasaurus carinthiacus is a nomen dubium'
- 'Shonisaurus belongs to Shastasaurinae'
- 'Shonisaurus popularis belongs to Shonisaurus' according to Camp 1976
- 'Simbirskiasaurus belongs to Ophthalmosauria'
- 'Stenopterygius belongs to Thunnosauria'
- 'Stenopterygius cuneiceps belongs to Stenopterygius' according to McGowan 1979
- 'Stenopterygius longifrons belongs to Stenopterygius' according to Owen 1881
- 'Stenopterygius macrophasma belongs to Stenopterygius' according to McGowan 1979
- 'Stenopterygius megalorhinus belongs to Stenopterygius' according to von Huene 1922
- 'Stenopterygius quadriscissus belongs to Stenopterygius' according to Quenstedt 1858
- 'Suevoleviathan belongs to Parvipelvia'
- 'Suevoleviathan disinteger belongs to Suevoleviathan' according to von Huene 1926
- 'Svalbardosaurus is a nomen dubium'
- 'Svalbardosaurus crassidens belongs to Svalbardosaurus' according to Mazin 1981
- 'Svalbardosaurus crassidens is a nomen dubium'
- 'Temnodontosaurus belongs to Parvipelvia'
- 'Temnodontosaurus burgundiae belongs to Temnodontosaurus' according to Gaudry 1892
- 'Temnodontosaurus eurycephalus belongs to Temnodontosaurus' according to C. McGowan 1974
- 'Temnodontosaurus platyodon belongs to Temnodontosaurus' according to Conybeare 1822
- 'Thaisaurus chonglakmanii belongs to Thaisaurus' according to Mazin et al. 1991
- 'Thunnosauria belongs to Parvipelvia'
- 'Toretocnemus belongs to Euichthyosauria'
- 'Toretocnemus zitteli belongs to Toretocnemus' according to Merriam 1903
- 'Utatsusaurus belongs to Ichthyopterygia'
- 'Wimanius odontopalatus belongs to Wimanius' according to Maisch and Matzke 1998