Opinions from C. Illiger 1811
- 'Aculeata belongs to Prensiculantia'
- 'Agilia belongs to Prensiculantia'
- 'Anarnak is replaced by Ancylodon'
- 'Aotus belongs to Quadrumana'
- 'Ateles belongs to Quadrumana'
- 'Balaena belongs to Cete'
- 'Bathyergus belongs to Murina'
- 'Callithrix belongs to Quadrumana'
- 'Castor belongs to Palmipeda'
- 'Cavia belongs to Subungulata'
- 'Ceratodon belongs to Cete'
- 'Cete was reranked as a family and belongs to Natantia'
- 'Chiromys belongs to Leptodactyla'
- 'Coelogenys belongs to Subungulata'
- 'Colobus belongs to Quadrumana'
- 'Cricetus belongs to Murina'
- 'Cunicularia belongs to Prensiculantia'
- 'Cynocephalus belongs to Quadrumana'
- 'Dasyprocta belongs to Subungulata'
- 'Delphinus belongs to Cete'
- 'Didelphis [misspelled as Didelphys] belongs to Marsupialia'
- 'Dipus belongs to Macropoda'
- 'Duplicidentata belongs to Prensiculantia'
- 'Echidna belongs to Muraenidae'
- 'Echidna is replaced by Tachyglossus'
- 'Erecta belongs to Mammalia'
- 'Fiber belongs to Cunicularia'
- 'Georychus belongs to Cunicularia'
- 'Halicore belongs to Sirenia'
- 'Halmaturus belongs to Salientia'
- 'Hapale belongs to Quadrumana'
- 'Homo belongs to Erecta'
- 'Hydrochoerus belongs to Subungulata'
- 'Hydromys belongs to Palmipeda'
- 'Hylobates belongs to Quadrumana'
- 'Hypsiprymnus belongs to Salientia'
- 'Hypudaeus belongs to Cunicularia'
- 'Hystrix belongs to Aculeata'
- 'Lagomys belongs to Duplicidentata'
- 'Lasiopyga belongs to Quadrumana'
- 'Lemur belongs to Prosimii'
- 'Leptodactyla belongs to Pollicata'
- 'Lepus belongs to Duplicidentata'
- 'Lichanotus belongs to Prosimii'
- 'Macropoda belongs to Prensiculantia'
- 'Macrotarsi belongs to Pollicata'
- 'Manatus belongs to Sirenia'
- 'Manis gigantea belongs to Manis'
- 'Marsupialia was reranked as a family and belongs to Pollicata'
- 'Meriones belongs to Macropoda'
- 'Murina belongs to Prensiculantia'
- 'Mus belongs to Murina'
- 'Mycetes belongs to Quadrumana'
- 'Myoxus belongs to Agilia'
- 'Myrmecophaga aculeata is recombined as Tachyglossus aculeata'
- 'Natantia belongs to Mammalia'
- 'Otolicnus belongs to Macrotarsi'
- 'Palmipeda belongs to Prensiculantia'
- 'Pedetes belongs to Macropoda'
- 'Phalangista belongs to Marsupialia'
- 'Phascolomys belongs to Marsupialia'
- 'Phoca belongs to Miomaci'
- 'Physeter belongs to Cete'
- 'Pinnipedia belongs to Mammalia'
- 'Pithecia belongs to Quadrumana'
- 'Pollicata belongs to Mammalia'
- 'Prensiculantia belongs to Mammalia'
- 'Prosimii belongs to Pollicata'
- 'Quadrumana belongs to Pollicata'
- 'Rytina belongs to Sirenia'
- 'Salientia belongs to Mammalia'
- 'Sciurus belongs to Agilia'
- 'Sciurus madagascariensis is recombined as Chiromys madagascariensis'
- 'Simia belongs to Quadrumana'
- 'Simia (Cercopithecus) was reranked as Cercopithecus and belongs to Quadrumana'
- 'Sirenia belongs to Natantia'
- 'Spalax belongs to Murina'
- 'Subungulata belongs to Prensiculantia'
- 'Tamias belongs to Agilia'
- 'Tarsius belongs to Macrotarsi'
- 'Trichechus belongs to Miomaci'
- 'Trichechus dugon is recombined as Halicore dugong'
- 'Uranodon belongs to Cete'