Opinions from H. F. Osborn 1903
- 'Acrosauridae belongs to Rhynchocephalia'
- 'Acrosaurus belongs to Acrosauridae'
- 'Anguisaurus belongs to Acrosauridae'
- 'Anomodontia was reranked as a superorder and belongs to Synapsida'
- 'Aphelosaurus belongs to Protorosauridae'
- 'Cetiosauria was reranked as a order and belongs to Dinosauria'
- 'Choristodera belongs to Diaptosauria'
- 'Cotylosauria was reranked as a order and belongs to Synapsida'
- 'Crocodilia belongs to Diapsida'
- 'Cynodontia was reranked as a order and belongs to Anomodontia'
- 'Diapsida belongs to Reptilia'
- 'Diaptosauria belongs to Diapsida'
- 'Dicynodontia was reranked as a suborder and belongs to Anomodontia'
- 'Dinosauria was reranked as a superorder and belongs to Diapsida'
- 'Euposaurus belongs to Homoesauridae'
- 'Gomphodontia was reranked as a order and belongs to Anomodontia'
- 'Homeosauridae [misspelled as Homoesauridae] belongs to Rhynchocephalia'
- 'Homoeosaurus belongs to Homoesauridae'
- 'Ichthyosauria belongs to Diapsida'
- 'Lacertilia belongs to Squamata'
- 'Mosasauria belongs to Squamata'
- 'Nothosauria belongs to Sauropterygia'
- 'Ophidia belongs to Squamata'
- 'Orthopoda was reranked as a order and belongs to Dinosauria'
- 'Palaeohatteria belongs to Palaeohatteriidae'
- 'Palaeohatteriidae belongs to Protorosauria'
- 'Pareiasauria is a subjective synonym of Cotylosauria'
- 'Pelycosauria belongs to Diaptosauria'
- 'Phytosauria was reranked as a order and belongs to Diapsida'
- 'Placodontia belongs to Anomodontia'
- 'Plesiosauria belongs to Sauropterygia'
- 'Pleurosauridae belongs to Rhynchocephalia'
- 'Pleurosaurus belongs to Pleurosauridae'
- 'Procolophonia was reranked as a order and belongs to Diaptosauria'
- 'Proganosauria belongs to Diaptosauria'
- 'Protorosauria belongs to Diaptosauria'
- 'Protorosauridae belongs to Protorosauria'
- 'Protorosaurus belongs to Protorosauridae'
- 'Pterosauria belongs to Diapsida'
- 'Rhynchocephalia belongs to Diaptosauria'
- 'Rhynchosauria belongs to Diaptosauria'
- 'Sapheosaurus [misspelled as Saphaeosaurus] belongs to Sauranodontidae'
- 'Sauranodon belongs to Sauranodontidae'
- 'Sauranodontes is corrected as Sauranodontidae and belongs to Rhynchocephalia'
- 'Saurophidium belongs to Acrosauridae'
- 'Sauropterygia was reranked as a superorder and belongs to Synapsida'
- 'Squamata was reranked as a superorder and belongs to Diapsida'
- 'Synapsida belongs to Reptilia'
- 'Testudinata belongs to Synapsida'
- 'Theriodontia belongs to Anomodontia'
- 'Theropoda belongs to Dinosauria'