Opinions from R. Estes 1976
- 'Acipenser belongs to Acipenseridae'
- 'Alligatorinae belongs to Crocodylidae'
- 'Amia belongs to Amiidae'
- 'Protamia is a subjective synonym of Amia'
- 'Amia (Protamia) uintaensis is recombined as Amia uintaensis' according to King 1878
- 'Amia (Protamia) uintaensis is recombined as Amia uintaensis'
- 'Amia fragosa belongs to Amia' according to Jordan 1927
- 'Amia fragosa belongs to Amia'
- 'Anguinae belongs to Anguidae'
- 'Champsosaurus belongs to Champsosauridae'
- 'Compsemys belongs to Baenidae'
- 'Compsemys victus is corrected as Compsemys victa and belongs to Compsemys'
- 'Coniophis belongs to Aniliidae'
- 'Contogenys belongs to Scincidae'
- 'Contogenys sloani belongs to Contogenys'
- 'Crocodylinae belongs to Crocodylidae'
- 'Dunnophis belongs to Serpentes'
- 'Exostinus belongs to Xenosauridae'
- 'Exostinus lancensis belongs to Exostinus'
- 'Gerrhonotus belongs to Anguinae'
- 'Habrosaurus belongs to Sirenidae'
- 'Habrosaurus dilatus belongs to Habrosaurus'
- 'Harpagosaurus parvus belongs to Harpagosaurus' according to Gilmore 1928
- 'Harpagosaurus parvus is a subjective synonym of Exostinus lancensis'
- 'Leidyosuchus belongs to Crocodylinae'
- 'Lepidotus occidentalis is recombined as Lepisosteus occidentalis'
- 'Lepisosteus belongs to Lepisosteidae'
- 'Lisserpeton belongs to Scapherpetonidae'
- 'Lisserpeton bairdi belongs to Lisserpeton'
- 'Oligodontosaurus belongs to Amphisbaenidae'
- 'Opisthotriton belongs to Batrachosauroididae'
- 'Opisthotriton kayi belongs to Opisthotriton'
- 'Palaeolabrus belongs to Palaeolabridae'
- 'Palaeolabrus montanensis belongs to Palaeolabrus'
- 'Palaeoxantusia belongs to Xantusiidae'
- 'Palaeoxantusia fera belongs to Palaeoxantusia'
- 'Palatobaena belongs to Baenidae'
- 'Palatobaena bairdi belongs to Palatobaena'
- 'Paleopsephurus belongs to Polyodontidae'
- 'Pancelosaurus belongs to Anguinae'
- 'Peltosaurus piger is recombined as Pancelosaurus piger'
- 'Plastomenus belongs to Trionychidae'
- 'Provaranosaurus belongs to Parasaniwidae'
- 'Scapherpeton belongs to Scapherpetonidae'
- 'Scapherpeton tectum belongs to Scapherpeton'
- 'Scotiophryne belongs to Discoglossidae'