Opinions from O. A. Peterson 1919

  • 'Achaenodontidae belongs to Artiodactyla'
  • 'Amynodon belongs to Amynodontinae'
  • 'Amynodontidae was reranked as the subfamily Amynodontinae and belongs to Hyracodontidae'
  • 'Anchitherium gracilis is recombined as Epihippus gracilis'
  • 'Archaenodon is corrected as Achaenodon and belongs to Achaenodontidae'
  • 'Archaenodon insolens is recombined as Achaenodon insolens'
  • 'Bunomeryx belongs to Homacodontinae'
  • 'Bunomeryx elegans belongs to Bunomeryx'
  • 'Camelomeryx is a subjective synonym of Leptoreodon'
  • 'Desmatotherium belongs to Hyrachyinae'
  • 'Desmatotherium guyotii belongs to Desmatotherium'
  • 'Dilophodon belongs to Ceratomorpha'
  • 'Dilophodon minusculus belongs to Dilophodon'
  • 'Diplobunops belongs to Anoplotheriidae'
  • 'Diplobunops matthewi belongs to Diplobunops'
  • 'Eomoropus belongs to Schizotheriinae'
  • 'Eomoropus annectens belongs to Eomoropus'
  • 'Epihippus belongs to Hyracotheriinae'
  • 'Epihippus parvus belongs to Epihippus'
  • 'Harpagolestes belongs to Mesonychidae'
  • 'Helaletes belongs to Helaletinae'
  • 'Helaletes boops belongs to Helaletes'
  • 'Helaletes latidens is recombined as Parisectolophus latidens'
  • 'Helaletidae belongs to Tapiroidea'
  • 'Helaletinae belongs to Helaletidae'
  • 'Homacodontidae was reranked as the subfamily Homacodontinae and belongs to Artiodactyla'
  • 'Homogalax belongs to Homogalaxinae'
  • 'Homogalaxinae belongs to Isectolophidae'
  • 'Hylomeryx belongs to Homacodontinae'
  • 'Hylomeryx annectens belongs to Hylomeryx'
  • 'Hyrachyidae was reranked as the subfamily Hyrachyinae and belongs to Hyracodontidae'
  • 'Hyrachyus belongs to Hyrachyinae'
  • 'Hyrachyus grande belongs to Hyrachyus'
  • 'Hyrachyus obliquidens is recombined as Prothyracodon obliquidens'
  • 'Hyracodontidae belongs to Perissodactyla'
  • 'Hyracodontinae belongs to Hyracodontidae'
  • 'Hyracotheriinae belongs to Equidae'
  • 'Ischyrotomus gidleyi belongs to Ischyrotomus'
  • 'Isectolophidae belongs to Tapiroidea'
  • 'Isectolophinae belongs to Isectolophidae'
  • 'Isectolophus belongs to Isectolophinae'
  • 'Isectolophus annectens belongs to Isectolophus'
  • 'Isectolophus scotti belongs to Isectolophus'
  • 'Leptoreodon belongs to Hypertragulidae'
  • 'Leptoreodon marshi belongs to Leptoreodon'
  • 'Leptotragulus belongs to Hypertragulidae'
  • 'Leptotragulus medius belongs to Leptotragulus'
  • 'Leptotragulus proavus belongs to Leptotragulus'
  • 'Limnocyon belongs to Oxyaenidae'
  • 'Limnocyon douglassi belongs to Limnocyon'
  • 'Lophiodon nanus is recombined as Helaletes nanus'
  • 'Mesomeryx belongs to Homacodontinae'
  • 'Mesomeryx grangeri belongs to Mesomeryx'
  • 'Mesonychidae belongs to Carnivora'
  • 'Mesonyx uintensis is recombined as Harpagolestes uintensis'
  • 'Mesonyx uintensis belongs to Mesonyx' according to Scott and Osborn 1887
  • 'Miacidae belongs to Carnivora'
  • 'Mimocyon belongs to Miacidae'
  • 'Mimocyon longipes belongs to Mimocyon'
  • 'Orohippus tapirinus is recombined as Eohippus tapirinus'
  • 'Oromeryx belongs to Hypertragulidae'
  • 'Oxyaenidae belongs to Carnivora'
  • 'Oxyaenodon belongs to Oxyaenidae'
  • 'Oxyaenodon dysclerus belongs to Oxyaenodon'
  • 'Oxyaenodon dysodus belongs to Oxyaenodon'
  • 'Parahyus belongs to Achaenodontidae'
  • 'Parahyus vagus belongs to Parahyus'
  • 'Parameryx is a subjective synonym of Leptotragulus'
  • 'Parameryx laevis is a nomen dubium'
  • 'Parameryx sulcatus is a nomen dubium'
  • 'Paramys belongs to Ischyromyidae'
  • 'Paramys (Ischyrotomus) was reranked as Ischyrotomus and belongs to Paramyidae'
  • 'Paramys compressidens belongs to Paramys'
  • 'Paramys medius belongs to Paramys'
  • 'Paramys robustus is recombined as Ischyrotomus robustus'
  • 'Paramys robustus belongs to Paramys' according to Matthew 1910
  • 'Pareumys belongs to Muridae'
  • 'Pareumys milleri belongs to Pareumys'
  • 'Parisectolophus belongs to Isectolophinae'
  • 'Pleurocyon belongs to Miacidae'
  • 'Pleurocyon magnus belongs to Pleurocyon'
  • 'Pleurocyon medius belongs to Pleurocyon'
  • 'Prodaphaenus belongs to Miacidae'
  • 'Prodaphaenus robustus belongs to Prodaphaenus'
  • 'Prosciurus robustus belongs to Prosciurus'
  • 'Protagriochoerus belongs to Agriochoeridae'
  • 'Protagriochoerus annectens belongs to Protagriochoerus'
  • 'Protelotherium is a subjective synonym of Achaenodon'
  • 'Protelotherium uintense is recombined as Achaenodon uintense'
  • 'Protelotherium uintense belongs to Protelotherium' according to Osborn 1895
  • 'Prothyracodon belongs to Hyracodontinae'
  • 'Prothyracodon uintense belongs to Prothyracodon'
  • 'Prothyracodon uintensis belongs to Prothyracodon'
  • 'Protoreodon belongs to Agriochoeridae'
  • 'Protoreodon medius belongs to Protoreodon'
  • 'Protylopus belongs to Camelidae'
  • 'Protylopus annectens belongs to Protylopus'
  • 'Protylopus petersoni belongs to Protylopus'
  • 'Schizolophodon belongs to Isectolophinae'
  • 'Schizolophodon cuspidens belongs to Schizolophodon'
  • 'Sciuravus belongs to Paramyidae'
  • 'Sciuravus altidens belongs to Sciuravus'
  • 'Sciurus (Prosciurus) was reranked as Prosciurus and belongs to Paramyidae'
  • 'Sphenomeryx belongs to Homacodontinae'
  • 'Sphenomeryx quadricuspis belongs to Sphenomeryx'
  • 'Systemodon is a subjective synonym of Eohippus'
  • 'Systemodontinae is an invalid subgroup of Isectolophidae'
  • 'Triplopodidae was reranked as the subfamily Triplopodinae and belongs to Hyracodontidae'
  • 'Triplopus belongs to Triplopodinae'
  • 'Triplopus cubitalis belongs to Triplopus'