Opinions from A. R. Tabrum and R. Nichols 2001

  • 'Aelurodon brachygnathus is recombined as Euoplocyon brachygnathus'
  • 'Agriochoerus minimus is recombined as Protoreodon minimus'
  • 'Altippus taxus is a nomen dubium'
  • 'Anchitherium minimus is recombined as Archaeohippus minimus'
  • 'Aphelops ceratorhinus is a subjective synonym of Peraceras superciliosum'
  • 'Aphelops montanus is a subjective synonym of Peraceras profectum'
  • 'Cosoryx agilis belongs to Cosoryx'
  • 'Cosoryx agilis is a nomen dubium' according to Sutton 1977
  • 'Desmatochoerus newchicagoensis is a subjective synonym of Mesoreodon chelonyx'
  • 'Dinocyon ossifragus is recombined as Pliocyon ossifragus'
  • 'Eucrotaphus helenae is a subjective synonym of Merycoidodon bullatus'
  • 'Eucrotaphus montanus is a subjective synonym of Mesoreodon chelonyx'
  • 'Eumys minor is a subjective synonym of Paradjidaumo trilophus'
  • 'Gomphotherium serus is a nomen dubium'
  • 'Hyaenodon minutus is a subjective synonym of Hyaenodon crucians'
  • 'Limnenetes belongs to Merycoidodontidae'
  • 'Limnenetes anceps is recombined as Oreonetes anceps'
  • 'Limnenetes platyceps belongs to Limnenetes'
  • 'Merychippus missouriensis belongs to Merychippus'
  • 'Merychyus smithi belongs to Merychyus'
  • 'Merycochoerus altiramus is a subjective synonym of Brachycrus laticeps'
  • 'Merycochoerus compressidens is a subjective synonym of Merychyus medius'
  • 'Merycochoerus elrodi is a subjective synonym of Brachycrus laticeps'
  • 'Merycochoerus laticeps is recombined as Brachycrus laticeps'
  • 'Merycochoerus madisonius is a subjective synonym of Brachycrus laticeps'
  • 'Merycoides cursor is a subjective synonym of Merycoides pariogonus'
  • 'Merycoides giganteus is a subjective synonym of Mesoreodon chelonyx'
  • 'Mesocyon drummondanus is a subjective synonym of Cynodesmus thooides'
  • 'Mesohippus portentus is a nomen dubium'
  • 'Mesoreodon latidens is a subjective synonym of Mesoreodon chelonyx'
  • 'Mesoreodon longiceps is recombined as Merycoides longiceps'
  • 'Mustela madisonae is recombined as Miomustela madisonae'
  • 'Mustela madisonae is recombined as Miomustela madisonae' according to Storer 1930
  • 'Mustela madisonae is recombined as Miomustela madisonae' according to Storer 1930
  • 'Mustela madisonae belongs to Mustela' according to Douglass 1929
  • 'Mylagaulus pristinus is recombined as Alphagaulus pristinus'
  • 'Mylagaulus proximus is a subjective synonym of Alphagaulus pristinus'
  • 'Oreodon macrorhinus is a subjective synonym of Merycoidodon culbertsonii'
  • 'Palaearctomys macrorhinus is a subjective synonym of Palaearctomys montanus'
  • 'Palaeomeryx americanus is recombined as Bouromeryx americanus'
  • 'Palaeomeryx madisonius is recombined as Bouromeryx madisonius'
  • 'Poatrephes is a subjective synonym of Ticholeptus'
  • 'Poatrephes paludicola is a subjective synonym of Ticholeptus zygomaticus'
  • 'Procamelus elrodi is recombined as Aepycamelus elrodi'
  • 'Procamelus lacustris is a subjective synonym of Procamelus occidentalis'
  • 'Procamelus madisonius is a subjective synonym of Aepycamelus robustus'
  • 'Promerycochoerus erythroceps is a subjective synonym of Mesoreodon chelonyx'
  • 'Promerycochoerus grandis is a subjective synonym of Merycochoerus superbus'
  • 'Promerycochoerus grinnelli is a subjective synonym of Mesoreodon chelonyx'
  • 'Promerycochoerus hatcheri is a subjective synonym of Merycochoerus superbus'
  • 'Promerycochoerus hollandi is a subjective synonym of Merycochoerus superbus'
  • 'Promerycochoerus minor is recombined as Mesoreodon minor'
  • 'Promerycochoerus thorpei is a subjective synonym of Mesoreodon chelonyx'
  • 'Protolabis montanus is recombined as Miolabis montanus'
  • 'Pseudodesmatochoerus hoffmani is a subjective synonym of Mesoreodon chelonyx'
  • 'Sciurus arctomyoides is recombined as Arctomyoides arctomyoides'
  • 'Sciurus jeffersoni is recombined as Douglassia jeffersoni'
  • 'Steneofiber complexus is a subjective synonym of Neatocastor hesperus'
  • 'Steneofiber hesperus is recombined as Neatocastor hesperus'
  • 'Talpa platybrachys is recombined as Domninoides platybrachys'
  • 'Talpa platybrachys is recombined as Domninoides platybrachys' according to Sutton 1977
  • 'Ticholeptus bannackensis is recombined as Hypsiops bannackensis'
  • 'Ticholeptus brachymelis is a subjective synonym of Hypsiops breviceps'
  • 'Ticholeptus breviceps is recombined as Hypsiops breviceps'
  • 'Xenotherium is replaced by Epoicotherium'
  • 'Xenotherium unicum is recombined as Epoicotherium unicum'