Opinions from E. L. Lundelius 1972
- 'Aenocyon is a subjective synonym of Canis'
- 'Aenocyon is a subjective synonym of Canis' according to Kurten and Anderson 1972
- 'Aenocyon is a subjective synonym of Canis' according to Stock et al. 1946
- 'Arctodus floridanus is recombined as Tremarctos floridanus'
- 'Arctodus floridanus is recombined as Tremarctos floridanus' according to Kurten 1963
- 'Arctodus floridanus belongs to Arctodus' according to Gidley 1928
- 'Arctomys ludoviciana is recombined as Cynomys ludovicianus'
- 'Arctomys ludoviciana is recombined as Cynomys ludovicianus' according to Hollister 1916
- 'Arctomys ludoviciana is recombined as Cynomys ludovicianus' according to Baird 1858
- 'Arctomys ludoviciana belongs to Arctomys' according to Ord 1815
- 'Breameryx belongs to '
- 'Breameryx belongs to ' according to Furlong 1946
- 'Canis ayersi is a subjective synonym of Canis dirus'
- 'Canis dirus belongs to Canis'
- 'Canis dirus belongs to Canis' according to Kurten and Anderson 1972
- 'Canis dirus belongs to Canis' according to Stock et al. 1946
- 'Capromeryx minor is recombined as Breameryx minor'
- 'Capromeryx minor is recombined as Breameryx minor' according to Furlong 1946
- 'Dama virginiana is recombined as Odocoileus virginianus'
- 'Dama virginiana is recombined as Odocoileus virginianus' according to Miller and Kellogg 1955
- 'Dama virginiana belongs to Dama' according to Zimmermann 1780
- 'Elephas americanus is recombined as Mammut americanum' according to Blumenbach 1799
- 'Elephas americanus is recombined as Mastodon americanus' according to Osborn 1942
- 'Elephas americanus is recombined as Mastodon americanus' according to Cuvier 1817
- 'Elephas americanus belongs to Elephas' according to Kerr 1792
- 'Elephas americanus is recombined as Mammut americanum'
- 'Elephas columbi is recombined as Mammuthus columbi'
- 'Elephas columbi is recombined as Mammuthus columbi' according to Aguirre 1969
- 'Equus (Hesperohippus) mexicanus is a subjective synonym of Equus pacificus'
- 'Equus complicatus belongs to Equus'
- 'Equus fraternus belongs to Equus'
- 'Equus leidyi is a subjective synonym of Equus fraternus'
- 'Equus midlandensis is a subjective synonym of Equus scotti'
- 'Equus pacificus belongs to Equus'
- 'Equus quinni is a subjective synonym of Equus francisci'
- 'Ereptodon priscus is a subjective synonym of Megalonyx jeffersonii'
- 'Ereptodon priscus is recombined as Megalonyx priscus' according to Cope 1899
- 'Felis atrox is recombined as Panthera atrox'
- 'Felis rufa is recombined as Lynx rufus'
- 'Felis rufa belongs to Felis' according to Schreber 1776
- 'Glyptodon petaliferus is a nomen nudum'
- 'Glyptodon petaliferus is a nomen nudum' according to Simpson 1929
- 'Glyptodon petaliferus belongs to Glyptodon' according to Cope 1888
- 'Glyptodon rivapacis is a nomen nudum'
- 'Glyptodon rivapacis is a nomen nudum' according to Simpson 1929
- 'Glyptodon rivapacis belongs to Glyptodon' according to Hay 1923
- 'Glyptodon septentrionalis is recombined as Chlamydotherium septentrionalis'
- 'Glyptodon septentrionalis belongs to Glyptodon' according to Leidy 1889
- 'Megalonyx harlani is recombined as Paramylodon harlani'
- 'Megalonyx sphenodon is a subjective synonym of Megalonyx wheatleyi'
- 'Megatherium jeffersonii is recombined as Megalonyx jeffersonii'
- 'Megatherium jeffersonii is recombined as Megalonyx jeffersonii' according to Leidy 1855
- 'Megatherium jeffersonii is recombined as Megalonyx jeffersonii' according to Harlan 1825
- 'Megatherium jeffersonii belongs to Megatherium' according to Desmarest 1822
- 'Mylodon garmani is a subjective synonym of Paramylodon harlani'
- 'Paramylodon nebrascensis is a subjective synonym of Paramylodon harlani'
- 'Smilodon nebraskensis is a subjective synonym of Smilodon fatalis'
- 'Smilodon nebraskensis is a subjective synonym of Smilodon fatalis' according to Slaughter 1963
- 'Smilodon trinitiensis is a subjective synonym of Smilodon fatalis'
- 'Smilodon trinitiensis is a subjective synonym of Smilodon fatalis' according to Slaughter 1963
- 'Smilodontopsis conardi is a subjective synonym of Smilodon fatalis'
- 'Smilodontopsis conardi is a subjective synonym of Smilodon fatalis' according to Slaughter 1963
- 'Smilodontopsis troglodytes is a subjective synonym of Smilodon fatalis'
- 'Smilodontopsis troglodytes is a subjective synonym of Smilodon fatalis' according to Slaughter 1963
- 'Tremarctos mexicanus is a subjective synonym of Tremarctos floridanus'
- 'Viverra mephitis is recombined as Mephitis mephitis'