Opinions from T. E. White 1940
- 'Apractocleidus belongs to Cryptoclididae'
- 'Brachauchenius belongs to Pliosauridae'
- 'Brancasauridae belongs to Plesiosauria'
- 'Brancasaurus belongs to Brancasauridae'
- 'Cimoliasaurus is corrected as Cimoliosaurus and belongs to Elasmosauridae'
- 'Cimoliosaurus durobrivensis is recombined as Tremamesacleis durobrivensis'
- 'Colymbosaurus belongs to Muraenosauridae'
- 'Cryptoclididae belongs to Plesiosauria'
- 'Elasmosauridae belongs to Plesiosauria'
- 'Elasmosaurus belongs to Elasmosauridae'
- 'Eretmosaurus belongs to Pliosauridae'
- 'Eurycleidus belongs to Leptocleididae'
- 'Kronosaurus belongs to Pliosauridae'
- 'Leptocleididae belongs to Plesiosauria'
- 'Leptocleidus belongs to Leptocleididae'
- 'Macroplata belongs to Plesiosauridae'
- 'Mauisaurus belongs to Cryptoclididae'
- 'Microcleidus belongs to Cryptoclididae'
- 'Muraenosauridae belongs to Plesiosauria'
- 'Muraenosaurus belongs to Muraenosauridae'
- 'Peloneustes belongs to Pliosauridae'
- 'Picrocleidus belongs to Muraenosauridae'
- 'Plesiosauridae belongs to Plesiosauria'
- 'Plesiosaurus belongs to Plesiosauridae'
- 'Plesiosaurus (Pleiosaurus) was reranked as Pliosaurus and belongs to Pliosauridae'
- 'Plesiosaurus longirostris is recombined as Macroplata longirostris'
- 'Pliosauridae belongs to Plesiosauria'
- 'Polycotylidae belongs to Plesiosauria'
- 'Polycotylus belongs to Polycotylidae'
- 'Polyptychodon belongs to Polycotylidae'
- 'Rhomaleosaurus belongs to Leptocleididae'
- 'Seeleyosaurus belongs to Brancasauridae'
- 'Seeleyosaurus holzmadensis belongs to Seeleyosaurus'
- 'Simolestes belongs to Elasmosauridae'
- 'Sthenarosaurus belongs to Plesiosauridae'
- 'Thaumatosaurus belongs to Brancasauridae'
- 'Tremamesacleididae belongs to Plesiosauria'
- 'Tremamesacleis belongs to Tremamesacleididae'
- 'Tricleidus belongs to Muraenosauridae'
- 'Trinacromerum belongs to Polycotylidae'