Opinions from R. Lydekker 1889
- 'Brimosaurus is a subjective synonym of Cimoliosaurus'
- 'Cimoliasaurus [misspelled as Cimoliosaurus] belongs to Plesiosauridae'
- 'Cimoliasaurus valdensis [misspelled as Cimoliosaurus valdensis] belongs to Cimoliosaurus'
- 'Cimoliasaurus valdensis is recombined as Cimoliosaurus valdensis'
- 'Cimoliosaurus biangulatus belongs to Cimoliosaurus' according to Cope 1869
- 'Cimoliosaurus biangulatus is a subjective synonym of Cimoliosaurus portlandicus'
- 'Cimoliosaurus cantabrigiensis belongs to Cimoliosaurus'
- 'Cimoliosaurus magnus belongs to Cimoliosaurus' according to Leidy 1852
- 'Cimoliosaurus plicatus belongs to Cimoliosaurus' according to Phillips 1871
- 'Cimoliosaurus richardsoni belongs to Cimoliosaurus'
- 'Cimoliosaurus triangulatus belongs to Cimoliosaurus' according to Cope 1869
- 'Cimoliosaurus triangulatus is a subjective synonym of Cimoliosaurus portlandicus'
- 'Colymbosaurus is a subjective synonym of Cimoliosaurus'
- 'Conchiosaurus belongs to Nothosauridae'
- 'Discosaurus is a subjective synonym of Cimoliosaurus'
- 'Discosaurus vetustus is a subjective synonym of Cimoliosaurus magnus'
- 'Dracosaurus is a subjective synonym of Nothosaurus'
- 'Dracosaurus bronni belongs to Dracosaurus' according to Auct 1834
- 'Dracosaurus bronni is a subjective synonym of Nothosaurus mirabilis'
- 'Elasmosaurus is a subjective synonym of Cimoliosaurus'
- 'Elasmosaurus platyurus is recombined as Cimoliosaurus platyurus'
- 'Eretmosaurus belongs to Plesiosauridae'
- 'Gryphus is a subjective synonym of Ichthyosaurus'
- 'Ichthyosauridae belongs to Ichthyopterygia'
- 'Ichthyosaurus belongs to Ichthyopterygia'
- 'Ichthyosaurus acutirostris belongs to Ichthyosaurus'
- 'Ichthyosaurus australis belongs to Ichthyosaurus'
- 'Ichthyosaurus australis is replaced by Ichthyosaurus hectori'
- 'Ichthyosaurus brachyspondylus is a subjective synonym of Ichthyosaurus thyreospondylus'
- 'Ichthyosaurus brachyspondylus belongs to Ichthyosaurus' according to Owen 1881
- 'Ichthyosaurus breviceps belongs to Ichthyosaurus'
- 'Ichthyosaurus campylodon belongs to Ichthyosaurus' according to Carter 1846
- 'Ichthyosaurus campylodon belongs to Ichthyosaurus'
- 'Ichthyosaurus chiroparamecostinus is a subjective synonym of Ichthyosaurus intermedius'
- 'Ichthyosaurus chiropolyostinus is a subjective synonym of Ichthyosaurus communis'
- 'Ichthyosaurus chirostrongulostinus is a subjective synonym of Ichthyosaurus tenuirostris'
- 'Ichthyosaurus communis belongs to Ichthyosaurus'
- 'Ichthyosaurus conybeari belongs to Ichthyosaurus'
- 'Ichthyosaurus crassimanus belongs to Ichthyosaurus' according to Blake 1876
- 'Ichthyosaurus crassimanus is a subjective synonym of Ichthyosaurus trigonodon'
- 'Ichthyosaurus cuvieri belongs to Ichthyosaurus' according to Valenciennes 1861
- 'Ichthyosaurus cuvieri is a subjective synonym of Ichthyosaurus trigonus'
- 'Ichthyosaurus dilatatus belongs to Ichthyosaurus' according to Phillips 1871
- 'Ichthyosaurus enthekiodon is corrected as Ichthyosaurus entheciodon and belongs to Ichthyosaurus'
- 'Ichthyosaurus giganteus belongs to Ichthyosaurus' according to Leach 1840
- 'Ichthyosaurus giganteus is a subjective synonym of Ichthyosaurus platyodon'
- 'Ichthyosaurus grandipes belongs to Ichthyosaurus' according to Sharpe 1830
- 'Ichthyosaurus grandipes is a subjective synonym of Ichthyosaurus tenuirostris'
- 'Ichthyosaurus indicus belongs to Ichthyosaurus'
- 'Ichthyosaurus integer belongs to Ichthyosaurus' according to Bronn 1844
- 'Ichthyosaurus integer belongs to Ichthyosaurus'
- 'Ichthyosaurus intermedius belongs to Ichthyosaurus'
- 'Ichthyosaurus latifrons belongs to Ichthyosaurus'
- 'Ichthyosaurus leptospondylus belongs to Ichthyosaurus' according to Wagner 1853
- 'Ichthyosaurus leptospondylus belongs to Ichthyosaurus'
- 'Ichthyosaurus longifrons belongs to Ichthyosaurus' according to Owen 1881
- 'Ichthyosaurus longifrons is a subjective synonym of Ichthyosaurus zetlandicus'
- 'Ichthyosaurus longirostris is a subjective synonym of Ichthyosaurus latifrons'
- 'Ichthyosaurus microdon belongs to Ichthyosaurus' according to Wagner 1851
- 'Ichthyosaurus microdon is a subjective synonym of Ichthyosaurus acutirostris'
- 'Ichthyosaurus normanniae belongs to Ichthyosaurus' according to Valenciennes 1861
- 'Ichthyosaurus normanniae is a subjective synonym of Ichthyosaurus trigonus'
- 'Ichthyosaurus ovalis belongs to Ichthyosaurus' according to Phillips 1871
- 'Ichthyosaurus ovalis belongs to Ichthyosaurus'
- 'Ichthyosaurus posthumus belongs to Ichthyosaurus' according to Wagner 1851
- 'Ichthyosaurus posthumus is a subjective synonym of Ichthyosaurus trigonus'
- 'Ichthyosaurus sinuatus belongs to Ichthyosaurus' according to Theodori 1854
- 'Ichthyosaurus sinuatus is a subjective synonym of Ichthyosaurus tenuirostris'
- 'Ichthyosaurus tenuirostris belongs to Ichthyosaurus'
- 'Ichthyosaurus thyreospondylus belongs to Ichthyosaurus' according to Phillips 1871
- 'Ichthyosaurus trigonodon belongs to Ichthyosaurus' according to Theodori 1843
- 'Ichthyosaurus trigonus belongs to Ichthyosaurus'
- 'Ichthyosaurus zetlandicus belongs to Ichthyosaurus' according to Seeley 1880
- 'Ichthyosaurus zetlandicus belongs to Ichthyosaurus'
- 'Ischyrodon is a subjective synonym of Pliosaurus'
- 'Ischyrodon meriani is a subjective synonym of Pliosaurus macromerus'
- 'Lariosauridae belongs to Sauropterygia'
- 'Lariosaurus belongs to Lariosauridae'
- 'Liopleurodon is a subjective synonym of Pliosaurus'
- 'Liopleurodon bucklandi is a subjective synonym of Thaumatosaurus oolithicus'
- 'Liopleurodon ferox is recombined as Pliosaurus ferox'
- 'Liopleurodon grossouvrei is recombined as Pliosaurus grossouvrei'
- 'Lutkesaurus is a subjective synonym of Polyptychodon'
- 'Mauisaurus is a subjective synonym of Cimoliosaurus'
- 'Mauisaurus gardneri is recombined as Plesiosaurus gardneri' according to Whidborne 1881
- 'Mauisaurus gardneri belongs to Mauisaurus' according to Seeley 1878
- 'Plesiosaurus gardneri is a subjective synonym of Cimoliosaurus constrictus'
- 'Mauisaurus haasti belongs to Mauisaurus' according to Hector 1874
- 'Mauisaurus haasti is recombined as Cimoliosaurus haasti'
- 'Mesosaurus belongs to Mesosauridae'
- 'Mesosaurus tenuidens belongs to Mesosaurus'
- 'Muraenosaurus is a subjective synonym of Cimoliosaurus'
- 'Muraenosaurus brevior is recombined as Cimoliosaurus brevior'
- 'Muraenosaurus leedsi is a subjective synonym of Cimoliosaurus plicatus'
- 'Nothosauridae belongs to Sauropterygia'
- 'Nothosaurus belongs to Nothosauridae'
- 'Nothosaurus aduncidens is a subjective synonym of Nothosaurus giganteus'
- 'Nothosaurus giganteus belongs to Nothosaurus' according to Munster 1834
- 'Nothosaurus mirabilis belongs to Nothosaurus'
- 'Nothosaurus venustus belongs to Nothosaurus' according to Munster 1834
- 'Nothosaurus venustus is a subjective synonym of Conchiosaurus clavatus'
- 'Oligosimus is a subjective synonym of Cimoliosaurus'
- 'Peloneustes belongs to Plesiosauridae'
- 'Piptomerus is a subjective synonym of Cimoliosaurus'
- 'Pistosaurus belongs to Nothosauridae'
- 'Pistosaurus longaevus belongs to Pistosaurus'
- 'Pleiosaurus macromerus is recombined as Pliosaurus macromerus'
- 'Plesiosauridae belongs to Sauropterygia'
- 'Plesiosaurus belongs to Plesiosauridae'
- 'Plesiosaurus (Pleiosaurus) was reranked as Pliosaurus and belongs to Plesiosauridae'
- 'Plesiosaurus (Pleiosaurus) brachydeirus [misspelled as Pliosaurus brachydirus] belongs to Pliosaurus'
- 'Plesiosaurus affinis is a subjective synonym of Cimoliosaurus trochanterius'
- 'Plesiosaurus arcuatus is recombined as Thaumatosaurus arcuatus'
- 'Plesiosaurus australis is recombined as Cimoliosaurus australis'
- 'Plesiosaurus balticus is a subjective synonym of Cimoliosaurus bernardi'
- 'Plesiosaurus bernardi is recombined as Cimoliosaurus bernardi'
- 'Plesiosaurus bitractensis belongs to Plesiosaurus'
- 'Plesiosaurus brachistospondylus is recombined as Cimoliosaurus brachistospondylus'
- 'Plesiosaurus brachycephalus belongs to Plesiosaurus' according to Owen 1840
- 'Plesiosaurus brachycephalus is a subjective synonym of Plesiosaurus macrocephalus'
- 'Plesiosaurus carinatus belongs to Plesiosaurus' according to Cuvier 1824
- 'Plesiosaurus carinatus is recombined as Thaumatosaurus carinatus'
- 'Plesiosaurus chilensis is recombined as Cimoliosaurus chilensis'
- 'Plesiosaurus cliduchus belongs to Plesiosaurus' according to Seeley 1865
- 'Plesiosaurus cliduchus is a subjective synonym of Plesiosaurus dolichodeirus'
- 'Plesiosaurus constrictus is recombined as Cimoliosaurus constrictus'
- 'Plesiosaurus constrictus is recombined as Elasmosaurus constrictus' according to Cope 1869
- 'Plesiosaurus conybeari belongs to Plesiosaurus'
- 'Plesiosaurus costatus belongs to Plesiosaurus'
- 'Plesiosaurus cramptoni belongs to Plesiosaurus' according to Carte and Baily 1863
- 'Plesiosaurus cramptoni is recombined as Thaumatosaurus cramptoni'
- 'Plesiosaurus crassicostatus is a subjective synonym of Cimoliosaurus australis'
- 'Plesiosaurus degenhardti is a subjective synonym of Cimoliosaurus limnophilus'
- 'Plesiosaurus doedicomus is a subjective synonym of Cimoliosaurus truncatus'
- 'Plesiosaurus eleutheraxon belongs to Plesiosaurus' according to Seeley 1865
- 'Plesiosaurus eleutheraxon belongs to Plesiosaurus'
- 'Plesiosaurus etheridgei belongs to Plesiosaurus' according to Huxley 1858
- 'Plesiosaurus etheridgei is a subjective synonym of Plesiosaurus hawkinsii'
- 'Plesiosaurus eurymerus is recombined as Cimoliosaurus eurymerus'
- 'Plesiosaurus giganteus is a subjective synonym of Pliosaurus brachydirus'
- 'Pliosaurus grandis is a subjective synonym of Pliosaurus macromerus'
- 'Plesiosaurus gurgitis belongs to Plesiosaurus' according to Renevier 1858
- 'Plesiosaurus gurgitis is a subjective synonym of Cimoliosaurus neocomiensis'
- 'Plesiosaurus hawkinsii belongs to Plesiosaurus'
- 'Plesiosaurus hexagonalis belongs to Plesiosaurus' according to Phillips 1871
- 'Plesiosaurus hexagonalis is a subjective synonym of Cimoliosaurus plicatus'
- 'Plesiosaurus homalospondylus belongs to Plesiosaurus'
- 'Plesiosaurus hoodii is recombined as Cimoliosaurus hoodii'
- 'Plesiosaurus ichthyospondylus belongs to Plesiosaurus' according to Seeley 1869
- 'Plesiosaurus ichthyospondylus is a subjective synonym of Cimoliosaurus bernardi'
- 'Plesiosaurus indicus is recombined as Thaumatosaurus indicus'
- 'Plesiosaurus infraplanus belongs to Plesiosaurus' according to Phillips 1871
- 'Plesiosaurus infraplanus is a subjective synonym of Cimoliosaurus plicatus'
- 'Plesiosaurus laticeps belongs to Plesiosaurus' according to Owen 1867
- 'Plesiosaurus laticeps is a subjective synonym of Plesiosaurus conybeari'
- 'Plesiosaurus latispinus belongs to Plesiosaurus' according to Owen 1854
- 'Plesiosaurus latispinus is recombined as Cimoliosaurus latispinus'
- 'Plesiosaurus limnophilus is recombined as Cimoliosaurus limnophilus'
- 'Plesiosaurus macrocephalus belongs to Plesiosaurus'
- 'Plesiosaurus manseli is a subjective synonym of Cimoliosaurus trochanterius'
- 'Plesiosaurus megacephalus is recombined as Thaumatosaurus megacephalus'
- 'Plesiosaurus megadirus is a subjective synonym of Cimoliosaurus trochanterius'
- 'Plesiosaurus neocomiensis belongs to Plesiosaurus' according to Campiche 1860
- 'Plesiosaurus neocomiensis is recombined as Cimoliosaurus neocomiensis'
- 'Plesiosaurus oxoniensis is recombined as Cimoliosaurus oxoniensis'
- 'Plesiosaurus philarchus is recombined as Peloneustes philarchus'
- 'Plesiosaurus phillipsi belongs to Plesiosaurus' according to Sauvage 1871
- 'Plesiosaurus phillipsi is a subjective synonym of Cimoliosaurus portlandicus'
- 'Plesiosaurus planus is recombined as Cimoliosaurus planus'
- 'Plesiosaurus propinquus is recombined as Thaumatosaurus propinquus'
- 'Plesiosaurus propinquus belongs to Plesiosaurus' according to Blake 1876
- 'Plesiosaurus rostratus belongs to Plesiosaurus' according to Owen 1865
- 'Plesiosaurus rostratus belongs to Plesiosaurus'
- 'Plesiosaurus rugosus is recombined as Eretmosaurus rugosus'
- 'Plesiosaurus simpsoni belongs to Plesiosaurus' according to Blake 1876
- 'Plesiosaurus simpsoni is a subjective synonym of Thaumatosaurus propinquus'
- 'Plesiosaurus smithi belongs to Plesiosaurus' according to Owen 1884
- 'Plesiosaurus smithi is recombined as Cimoliosaurus smithi'
- 'Plesiosaurus speciosus belongs to Plesiosaurus' according to Munster 1834
- 'Plesiosaurus speciosus is a subjective synonym of Nothosaurus mirabilis'
- 'Plesiosaurus subdepressus belongs to Plesiosaurus' according to Owen 1854
- 'Plesiosaurus subdepressus is a subjective synonym of Cimoliosaurus truncatus'
- 'Plesiosaurus triatarsostinus is a subjective synonym of Plesiosaurus hawkinsii'
- 'Plesiosaurus trochanterius is recombined as Cimoliosaurus trochanterius'
- 'Pliosaurus trochanterius is a subjective synonym of Cimoliosaurus trochanterius'
- 'Plesiosaurus truncatus belongs to Plesiosaurus' according to Owen 1854
- 'Plesiosaurus truncatus is recombined as Cimoliosaurus truncatus'
- 'Plesiosaurus validus belongs to Plesiosaurus' according to Phillips 1871
- 'Plesiosaurus validus is a subjective synonym of Cimoliosaurus trochanterius'
- 'Plesiosaurus winspitensis belongs to Plesiosaurus' according to Seeley 1871
- 'Plesiosaurus winspitensis is a subjective synonym of Cimoliosaurus portlandicus'
- 'Pliosaurus aequalis belongs to Pliosaurus' according to Phillips 1871
- 'Pliosaurus aequalis is recombined as Peloneustes aequalis'
- 'Pliosaurus evansi belongs to Pliosaurus'
- 'Pliosaurus gigas is a subjective synonym of Cimoliosaurus constrictus'
- 'Pliosaurus pachydirus is a subjective synonym of Pliosaurus ferox'
- 'Pliosaurus portlandicus belongs to Pliosaurus' according to Owen 1869
- 'Pliosaurus portlandicus is recombined as Cimoliosaurus portlandicus'
- 'Pliosaurus sterrodirus belongs to Pliosaurus' according to Seeley 1869
- 'Pliosaurus sterrodirus is a subjective synonym of Peloneustes aequalis'
- 'Pliosaurus wosinskii is a subjective synonym of Pliosaurus grossouvrei'
- 'Polycotylus is a subjective synonym of Cimoliosaurus'
- 'Polycotylus tenuis is recombined as Cimoliosaurus tenuis'
- 'Polyptychodon belongs to Plesiosauridae'
- 'Polyptychodon continuus belongs to Polyptychodon' according to Owen 1841
- 'Polyptychodon interruptus belongs to Polyptychodon'
- 'Psilotrachelosaurus belongs to Lariosauridae'
- 'Rhomaleosaurus is a subjective synonym of Thaumatosaurus'
- 'Simosaurus pusillus belongs to Simosaurus' according to Fraas 1881
- 'Simosaurus pusillus is recombined as Neusticosaurus pusillus'
- 'Spondylosaurus is a subjective synonym of Pliosaurus'
- 'Spondylosaurus frearsi is a subjective synonym of Pliosaurus grossouvrei'
- 'Stereosternum is a subjective synonym of Mesosaurus'
- 'Stereosternum tumidum is recombined as Mesosaurus tumidus'
- 'Thaumatosaurus belongs to Plesiosauridae'
- 'Thaumatosaurus mosquensis is a subjective synonym of Pliosaurus ferox'
- 'Thaumatosaurus oolithicus belongs to Thaumatosaurus' according to Meyer 1841
- 'Trinacromerum is a subjective synonym of Cimoliosaurus'