Opinions from J. E. Gray 1821
- 'Agoutidae belongs to Rosores'
- 'Amphibiae belongs to Unguiculata'
- 'Anarnak is corrected as Anarnacus and belongs to Monodontidae'
- 'Anoplotheriadae belongs to Tesserachenae'
- 'Antilopidae belongs to Ruminantes'
- 'Arctomydae belongs to Rosores'
- 'Arvicolidae belongs to Rosores'
- 'Balaena belongs to Balaenidae'
- 'Balanadae belongs to Carnivorae'
- 'Bimanes belongs to Vertebrosa'
- 'Bovidae belongs to Ruminantes'
- 'Bradypidae [misspelled as Bradypidae] belongs to Tarigradae'
- 'Bruta [misspelled as Brutae] belongs to Pedimanes'
- 'Callitrichidae belongs to Platyonychae'
- 'Camelidae belongs to Hydrophorae'
- 'Canidae belongs to Digitigradae'
- 'Capridae belongs to Ruminantes'
- 'Caprinae belongs to Ruminantes'
- 'Carnivorae belongs to Cetaceae'
- 'Castoridae belongs to Rosores'
- 'Caviidae [misspelled as Caviadae] belongs to Rosores'
- 'Cercopithecidae belongs to Platyonychae'
- 'Cervidae belongs to Ruminantes'
- 'Cetacea was reranked as the class Cetaceae and belongs to Vertebrosa'
- 'Cheiromydae belongs to Rosores'
- 'Chiroptera was reranked as the class Cheiroptera and belongs to Vertebrosa'
- 'Colobus belongs to Cercopithecidae'
- 'Dasipidae belongs to Oligodontae'
- 'Delphinidae belongs to Carnivorae'
- 'Delphinus belongs to Delphinidae'
- 'Didelphidae belongs to Ferae'
- 'Digitigradae belongs to Unguiculata'
- 'Dipsidae belongs to Rosores'
- 'Dolichotinae belongs to Caviidae'
- 'Dugong belongs to Dugongidae'
- 'Dugongidae belongs to Herbivorae'
- 'Edentulae belongs to Unguiculata'
- 'Elephantidae belongs to Proboscidiae'
- 'Equidae belongs to Monochenae'
- 'Erinaceidae [misspelled as Erinacidae] belongs to Plantigradae'
- 'Felidae belongs to Digitigradae'
- 'Ferae belongs to Pedimanes'
- 'Fructivorae belongs to Cheiroptera'
- 'Galeopithecidae belongs to Pterophorae'
- 'Gampstonychae belongs to Quadrumanes'
- 'Giraffidae belongs to Ruminantes'
- 'Glires belongs to Pedimanes'
- 'Halamydae belongs to Rosores'
- 'Harpaladae belongs to Gampstonychae'
- 'Herbivorae belongs to Cetaceae'
- 'Heteronychae belongs to Quadrumanes'
- 'Hippopotamidae belongs to Tesserachenae'
- 'Hyaenidae [misspelled as Hyaenadae] belongs to Digitigradae'
- 'Hydrophorae belongs to Ungulata'
- 'Hyracidae belongs to Trichenae'
- 'Hystricidae [misspelled as Histricidae] belongs to Rosores'
- 'Insectivorae belongs to Cheiroptera'
- 'Koladae belongs to Brutae'
- 'Lemuridae belongs to Heteronychae'
- 'Leporidae belongs to Rosores'
- 'Leporinorum is replaced by Leporidae'
- 'Loridae belongs to Heteronychae'
- 'Macropidae belongs to Brutae'
- 'Manatidae belongs to Herbivorae'
- 'Manatus belongs to Manatidae'
- 'Manidae belongs to Edentulae'
- 'Mastodonadae belongs to Proboscidiae'
- 'Megatheriadae [misspelled as Megatheriadae] belongs to Oligodontae'
- 'Monochenae belongs to Ungulata'
- 'Monodon belongs to Monodontidae'
- 'Monodontidae belongs to Carnivorae'
- 'Moschidae belongs to Ruminantes'
- 'Muridae belongs to Rosores'
- 'Mustelidae [misspelled as Mustelladae] belongs to Digitigradae'
- 'Myaladae belongs to Plantigradae'
- 'Myosidae belongs to Rosores'
- 'Noctilionidae belongs to Insectivorae'
- 'Oligodontae belongs to Unguiculata'
- 'Orycteropodidae belongs to Oligodontae'
- 'Pedimanes belongs to Vertebrosa'
- 'Phalangistadae belongs to Ferae'
- 'Phascolomidae belongs to Glires'
- 'Phoca belongs to Phocidae'
- 'Phocadae belongs to Amphibiae'
- 'Phocaena belongs to Delphinidae'
- 'Physalus belongs to Balaenidae'
- 'Physeter belongs to Physeteridae'
- 'Physeter catodon belongs to Physeter'
- 'Physeteridae belongs to Carnivorae'
- 'Pithecidae belongs to Platyonychae'
- 'Plantigradae belongs to Unguiculata'
- 'Platyonychae belongs to Quadrumanes'
- 'Potoridae belongs to Brutae'
- 'Primates belongs to Bimanes'
- 'Proboscidea [misspelled as Proboscidiae] belongs to Ungulata'
- 'Pterophorae belongs to Unguiculata'
- 'Pteropidae belongs to Fructivorae'
- 'Quadripedes belongs to Vertebrosa'
- 'Quadrumana was reranked as the class Quadrumanes and belongs to Vertebrosa'
- 'Rhinoceros bicornis is recombined as Diceros bicornis'
- 'Rhinocerotidae belongs to Trichenae'
- 'Rosores belongs to Unguiculata'
- 'Ruminantes belongs to Ungulata'
- 'Sciuridae belongs to Rosores'
- 'Simia (Cercopithecus) was reranked as Cercopithecus and belongs to Cercopithecidae'
- 'Soricidae belongs to Plantigradae'
- 'Spalacidae belongs to Rosores'
- 'Suidae belongs to Tesserachenae'
- 'Taperidae belongs to Trichenae'
- 'Tardigrada [misspelled as Tarigradae] belongs to Unguiculata'
- 'Tenrecidae belongs to Plantigradae'
- 'Tesserachenae belongs to Ungulata'
- 'Trichechus belongs to Trichecidae'
- 'Trichecidae [misspelled as Trichecidae] belongs to Amphibiae'
- 'Trichenae belongs to Ungulata'
- 'Unguiculata belongs to Quadripedes'
- 'Ungulata was reranked as a subclass and belongs to Quadripedes'
- 'Ursinidae belongs to Plantigradae'
- 'Vertebrosa belongs to Animalia'
- 'Vespertilionidae belongs to Insectivorae'
- 'Viverridae belongs to Digitigradae'