Opinions from E. D. Cope 1881

  • 'Acoessus belongs to Menodontidae'
  • 'Anchilophus belongs to Palaeotheriinae'
  • 'Anchippus belongs to Palaeotheriinae'
  • 'Anchitherium belongs to Palaeotheriinae'
  • 'Aphelops belongs to Rhinoceridae'
  • 'Atelodus belongs to Rhinoceridae'
  • 'Caenopus belongs to Rhinoceridae'
  • 'Ceratorhinus belongs to Rhinoceridae'
  • 'Chalicotheriidae belongs to Perissodactyla'
  • 'Chalicotherium belongs to Chalicotheriidae'
  • 'Coelodonta belongs to Rhinoceridae'
  • 'Colonoceras belongs to Lophiodontinae'
  • 'Diceratherium belongs to Rhinoceridae'
  • 'Diplacodon belongs to Menodontidae'
  • 'Elasmognathus belongs to Tapiridae'
  • 'Equidae belongs to Perissodactyla'
  • 'Equus belongs to Equidae'
  • 'Equus (Protohippus) was reranked as Protohippus and belongs to Palaeotheriinae'
  • 'Helaletes belongs to Lophiodontinae'
  • 'Hippidion is corrected as Hippidium and belongs to Equidae'
  • 'Hippotherium belongs to Palaeotheriinae'
  • 'Hyrachyus belongs to Lophiodontinae'
  • 'Hyracodon belongs to Hyracodontidae'
  • 'Hyracodontidae belongs to Perissodactyla'
  • 'Hyracotheriinae belongs to Lophiodontidae'
  • 'Hyracotherium belongs to Hyracotheriinae'
  • 'Hyracotherium siderolithicum belongs to Hyracotherium' according to Pictet 1869
  • 'Hyracotherium siderolithicum is recombined as Acoessus siderolithicum'
  • 'Lambdotherium belongs to Chalicotheriidae'
  • 'Leurocephalus belongs to Chalicotheriidae'
  • 'Limnohyus belongs to Chalicotheriidae'
  • 'Listriodon belongs to Tapiridae'
  • 'Lophiodon belongs to Lophiodontinae'
  • 'Lophiodontidae belongs to Perissodactyla'
  • 'Lophiodontinae belongs to Lophiodontidae'
  • 'Lophiotherium belongs to Hyracotheriinae'
  • 'Macrauchenia belongs to Macraucheniidae'
  • 'Macraucheniidae belongs to Perissodactyla'
  • 'Meniscotherium belongs to Chalicotheriidae'
  • 'Menodontidae belongs to Perissodactyla'
  • 'Mesohippus belongs to Palaeotheriinae'
  • 'Nestoritherium belongs to Chalicotheriidae'
  • 'Pachynolophus belongs to Lophiodontinae'
  • 'Palaeosyops belongs to Chalicotheriidae'
  • 'Palaeotheriidae belongs to Perissodactyla'
  • 'Palaeotheriina was reranked as the subfamily Palaeotheriinae and belongs to Palaeotheriidae'
  • 'Palaeotherium belongs to Palaeotheriinae'
  • 'Palaeotherium (Menodus) belongs to Palaeotherium' according to Pomel 1848
  • 'Palaeotherium (Menodus) was reranked as Menodus and belongs to Menodontidae'
  • 'Paloplotherium belongs to Palaeotheriinae'
  • 'Peraceras belongs to Rhinoceridae'
  • 'Pliolophus belongs to Hyracotheriinae'
  • 'Propalaeotherium belongs to Chalicotheriidae'
  • 'Rhagatherium belongs to Chalicotheriidae'
  • 'Rhinoceros [misspelled as Rhinocerus] belongs to Rhinoceridae'
  • 'Rhinocerotidae is corrected as Rhinoceridae and belongs to Perissodactyla'
  • 'Symborodon belongs to Menodontidae'
  • 'Taperidae is corrected as Tapiridae and belongs to Perissodactyla'
  • 'Tapirus belongs to Tapiridae'
  • 'Triplopodidae [misspelled as Triplopidae] belongs to Perissodactyla'
  • 'Triplopidae is a misspelling of Triplopodidae'
  • 'Triplopus belongs to Triplopidae'
  • 'Triplopus cubitalis belongs to Triplopus'
  • 'Zalabis belongs to Rhinoceridae'