Opinions from D. R. Prothero and R. M. Schoch 1989

  • 'Aceratheriinae belongs to Rhinocerotidae'
  • 'Aceratherium belongs to Aceratheriinae'
  • 'Acerorhinus belongs to Aceratheriinae'
  • 'Acrotitan belongs to Brontotheridae'
  • 'Alicornops belongs to Aceratheriinae'
  • 'Allacerops is a subjective synonym of Eggysodon'
  • 'Alloceropinae belongs to Hyracodontidae'
  • 'Allops is a subjective synonym of Menops'
  • 'Altungulata belongs to Ungulata'
  • 'Amphicaenopus belongs to Rhinocerotidae'
  • 'Anchilophus belongs to Pachynolophidae'
  • 'Anchitheridae was reranked as the subfamily Anchitheriinae and belongs to Equidae'
  • 'Anchitherium belongs to Anchitheriinae'
  • 'Anchitherium (Hypohippus) was reranked as Hypohippus and belongs to Anchitheriinae'
  • 'Anchitherium (Parahippus) was reranked as Parahippus and belongs to Equinae'
  • 'Ancylopoda was reranked as a unranked clade and belongs to Rhinotapiromorpha'
  • 'Ancylotherium belongs to Schizotheriinae'
  • 'Aphelops belongs to Aceratheriinae'
  • 'Aprotodon belongs to Teleoceratini'
  • 'Archaeohippus belongs to Equinae'
  • 'Ardynia belongs to Hyracodontinae'
  • 'Asinus is a subjective synonym of Equus'
  • 'Atalonodon belongs to Lophiodontidae'
  • 'Aulaxolophus belongs to Rhinotapiromorpha'
  • 'Borissiakia belongs to Schizotheriinae'
  • 'Brachydiastematherium belongs to Brontotheridae'
  • 'Brachydiceratherium belongs to Teleoceratini'
  • 'Brachypodella belongs to Teleoceratini'
  • 'Brachypotherium belongs to Teleoceratini'
  • 'Brontops belongs to Telmatheriinae'
  • 'Brontotheridae is corrected as Brontotheriidae and belongs to Brontotherioidea'
  • 'Brontotherioidea belongs to Titanotheriomorpha'
  • 'Brontotherium is a subjective synonym of Megacerops'
  • 'Bunohyrax belongs to Saghatheriinae'
  • 'Caenopus is a subjective synonym of Subhyracodon'
  • 'Cantabrotherium belongs to Palaeotheriidae'
  • 'Ceratorhinus is a subjective synonym of Dicerorhinus'
  • 'Ceratotherium belongs to Dicerotina'
  • 'Chalicotheriidae belongs to Chalicotherioidea'
  • 'Chalicotheriinae belongs to Chalicotheriidae'
  • 'Chalicotherioidea belongs to Ancylopoda'
  • 'Chalicotherium belongs to Chalicotheriinae'
  • 'Chemositia is a subjective synonym of Ancylotherium'
  • 'Chilotheridium belongs to Aceratheriinae'
  • 'Chilotherium belongs to Aceratheriinae'
  • 'Coelodonta belongs to Dicerorhinina'
  • 'Colonoceras is a subjective synonym of Hyrachyus'
  • 'Cormohipparion belongs to Hippotheriini'
  • 'Cymbalophus belongs to Equoidea'
  • 'Dendrohyrax belongs to Procaviidae'
  • 'Dendrohyrax (Heterohyrax) was reranked as Heterohyrax and belongs to Procaviidae'
  • 'Desmatotitan belongs to Brontotheridae'
  • 'Diaceratherium belongs to Teleoceratini'
  • 'Dianotitan belongs to Brontotheridae'
  • 'Diceratheriinae belongs to Rhinocerotidae'
  • 'Diceratherium belongs to Diceratheriinae'
  • 'Dicerorhinini was reranked as the subtribe Dicerorhinina and belongs to Rhinocerotini'
  • 'Dicerorhinus belongs to Dicerorhinina'
  • 'Diceros belongs to Dicerotina'
  • 'Dicerotini was reranked as the subtribe Dicerotina and belongs to Rhinocerotini'
  • 'Didermocerus is a subjective synonym of Dicerorhinus'
  • 'Dilophodon belongs to Tapiroidea'
  • 'Dinohippus belongs to Equini'
  • 'Diplacodon belongs to Brontotheridae'
  • 'Diploclonus is a subjective synonym of Brontops'
  • 'Dolichohippus is a subjective synonym of Equus'
  • 'Dolichorhinae is corrected as Dolichorhininae and belongs to Brontotheridae'
  • 'Dolichorhinoides belongs to Brontotheridae'
  • 'Dolichorhinus belongs to Dolichorhininae'
  • 'Dromoceratherium belongs to Aceratheriinae'
  • 'Duchesneodus belongs to Telmatheriinae'
  • 'Eggysodon belongs to Alloceropinae'
  • 'Elasmotheriina was reranked as a subtribe and belongs to Rhinocerotini'
  • 'Elasmotherium belongs to Elasmotheriina'
  • 'Embolotherium belongs to Brontotheridae'
  • 'Embrithopoda belongs to Altungulata'
  • 'Eometarhinus is a subjective synonym of Palaeosyops'
  • 'Eomoropus belongs to Chalicotheriidae'
  • 'Eotitanops belongs to Brontotheridae'
  • 'Eotitanotherium belongs to Telmatheriinae'
  • 'Eotrigonias is a subjective synonym of Triplopus'
  • 'Epiaceratherium belongs to Rhinocerotidae'
  • 'Epihippus belongs to Equidae'
  • 'Epimanteoceras belongs to Brontotheridae'
  • 'Epitriplopus belongs to Hyracodontinae'
  • 'Equidae belongs to Equoidea'
  • 'Equinae belongs to Equidae'
  • 'Equini belongs to Equinae'
  • 'Equoidea belongs to Hippomorpha'
  • 'Equus belongs to Equini'
  • 'Equus (Protohippus) was reranked as Protohippus and belongs to Equini'
  • 'Ergilia is a subjective synonym of Ardynia'
  • 'Eutheria was reranked as a infraclass and belongs to Theria'
  • 'Floridaceras belongs to Aceratheriinae'
  • 'Gaindatherium belongs to Rhinocerotina'
  • 'Gansuodon is a subjective synonym of Ancylotherium'
  • 'Geniohyidae was reranked as the subfamily Geniohyinae and belongs to Pliohyracidae'
  • 'Geniohyus belongs to Geniohyinae'
  • 'Gigantohyrax belongs to Procaviidae'
  • 'Gnathotitan belongs to Brontotheridae'
  • 'Gobihippus belongs to Equidae'
  • 'Grangeria belongs to Chalicotheriidae'
  • 'Haplohippus belongs to Equidae'
  • 'Hemionus is a subjective synonym of Equus'
  • 'Heptacodon belongs to Embrithopoda'
  • 'Heteraletes is a subjective synonym of Dilophodon'
  • 'Hipparion belongs to Hippotheriini'
  • 'Hipparion (Nannippus) was reranked as Nannippus and belongs to Hippotheriini'
  • 'Hippidion belongs to Equini'
  • 'Hippomorpha was reranked as a infraorder and belongs to Mesaxonia'
  • 'Hippotheriina is corrected as Hippotheriini and belongs to Equinae'
  • 'Hippotherium belongs to Hippotheriini'
  • 'Hippotigris is a subjective synonym of Equus'
  • 'Hispanotherium belongs to Elasmotheriina'
  • 'Hoangkotherium is a subjective synonym of Ancylotherium'
  • 'Homogalax belongs to Isectolophidae'
  • 'Hoploaceratherium belongs to Aceratheriinae'
  • 'Hyotitan belongs to Brontotheridae'
  • 'Hyracodon belongs to Hyracodontinae'
  • 'Hyracoidea was reranked as a suborder and belongs to Perissodactyla'
  • 'Hyracotherium belongs to Equoidea'
  • 'Ilianodon belongs to Alloceropinae'
  • 'Indolophidae belongs to Hippomorpha'
  • 'Indolophus belongs to Indolophidae'
  • 'Iranotherium belongs to Elasmotheriina'
  • 'Isectolophidae belongs to Isectolophomorpha'
  • 'Isectolophomorpha belongs to Moropomorpha'
  • 'Isectolophus belongs to Isectolophidae'
  • 'Kalakotia belongs to Rhinotapiromorpha'
  • 'Kalobatippus belongs to Equinae'
  • 'Kenyatherium belongs to Elasmotheriina'
  • 'Kolpohippus is a subjective synonym of Equus'
  • 'Kraterohippus is a subjective synonym of Equus'
  • 'Kvabebihyrax belongs to Pliohyracinae'
  • 'Lambdotheriidae belongs to Brontotherioidea'
  • 'Lambdotherium belongs to Lambdotheriidae'
  • 'Lartetotherium belongs to Dicerorhinina'
  • 'Leptolophus belongs to Palaeotheriidae'
  • 'Leurocephalus is a subjective synonym of Telmatherium'
  • 'Limnohyops is a subjective synonym of Palaeosyops'
  • 'Limnohyus is a subjective synonym of Palaeosyops'
  • 'Litolophus belongs to Chalicotheriidae'
  • 'Lophiaspis belongs to Lophiodontidae'
  • 'Lophiodochoerus belongs to Lophiodontidae'
  • 'Lophiodon belongs to Lophiodontoidea'
  • 'Lophiodontidae belongs to Lophiodontoidea'
  • 'Lophiodontoidea belongs to Ancylopoda'
  • 'Lophiotherium belongs to Palaeotheriidae'
  • 'Lunania belongs to Embrithopoda'
  • 'Macrotherium belongs to Schizotheriinae'
  • 'Manteoceras is a subjective synonym of Telmatherium'
  • 'Megacerops belongs to Telmatheriinae'
  • 'Megahippus belongs to Anchitheriinae'
  • 'Megalohyrax belongs to Saghatheriinae'
  • 'Meninatherium is a subjective synonym of Prohyracodon'
  • 'Menoceras belongs to Menoceratinae'
  • 'Menoceratinae belongs to Rhinocerotidae'
  • 'Menops belongs to Telmatheriinae'
  • 'Meroehyrax belongs to Saghatheriinae'
  • 'Merychippus belongs to Equinae'
  • 'Mesaceratherium belongs to Aceratheriinae'
  • 'Mesatirhinus belongs to Dolichorhininae'
  • 'Mesaxonia was reranked as a suborder and belongs to Perissodactyla'
  • 'Meschotherium belongs to Rhinocerotoidea'
  • 'Mesohippus belongs to Equidae'
  • 'Metahyrachyus is a subjective synonym of Hyrachyus'
  • 'Metaschizotherium is a subjective synonym of Ancylotherium'
  • 'Metatelmatherium belongs to Telmatheriinae'
  • 'Metatitan belongs to Brontotheridae'
  • 'Microhyrax belongs to Saghatheriinae'
  • 'Microtitan belongs to Brontotheridae'
  • 'Miohippus belongs to Equidae'
  • 'Moropomorpha was reranked as a infraorder and belongs to Mesaxonia'
  • 'Moropus belongs to Schizotheriinae'
  • 'Moschoedestes is a subjective synonym of Menoceras'
  • 'Neohipparion belongs to Hippotheriini'
  • 'Neohippus is a subjective synonym of Equus'
  • 'Nestoritherium belongs to Chalicotheriinae'
  • 'Ninxiatherium belongs to Rhinocerotoidea'
  • 'Notiotitanops belongs to Telmatheriinae'
  • 'Notohipparion is a subjective synonym of Hipparion'
  • 'Olsenia belongs to Chalicotheriidae'
  • 'Onager is a subjective synonym of Equus'
  • 'Onohippidium belongs to Equini'
  • 'Orohippus belongs to Equidae'
  • 'Pachyhyrax belongs to Saghatheriinae'
  • 'Pachynolophidae belongs to Pachynolophoidea'
  • 'Pachynolophoidea belongs to Hippomorpha'
  • 'Pachynolophus belongs to Pachynolophidae'
  • 'Pachytitan belongs to Brontotheridae'
  • 'Palaeosyops belongs to Brontotheridae'
  • 'Palaeotheriidae belongs to Equoidea'
  • 'Palaeotherium belongs to Palaeotheriidae'
  • 'Menodus is a nomen dubium'
  • 'Paleomoropus belongs to Lophiodontidae'
  • 'Parabrontops belongs to Brontotheridae'
  • 'Paradiceros belongs to Dicerotina'
  • 'Parahipparion is a subjective synonym of Hippidion'
  • 'Paralophiodon belongs to Lophiodontidae'
  • 'Paraplagiolophus belongs to Palaeotheriidae'
  • 'Parapliohyrax belongs to Pliohyracinae'
  • 'Penetrigonias belongs to Rhinocerotidae'
  • 'Peraceras belongs to Aceratheriinae'
  • 'Perissodactyla was reranked as a order and belongs to Altungulata'
  • 'Phyllotillon belongs to Schizotheriinae'
  • 'Plagiolophus belongs to Palaeotheriidae'
  • 'Plesiaceratherium belongs to Aceratheriinae'
  • 'Plesippus is a subjective synonym of Equus'
  • 'Pleuroceros belongs to Menoceratinae'
  • 'Pliohippus belongs to Equini'
  • 'Pliohippus (Astrohippus) was reranked as Astrohippus and belongs to Equini'
  • 'Pliohyracidae belongs to Hyracoidea'
  • 'Pliohyracinae belongs to Pliohyracidae'
  • 'Pliohyrax belongs to Pliohyracinae'
  • 'Pliolophus belongs to Equoidea'
  • 'Postschizotherium belongs to Pliohyracinae'
  • 'Proaceratherium belongs to Aceratheriinae'
  • 'Proboscidipparion is a subjective synonym of Hipparion'
  • 'Procavia belongs to Procaviidae'
  • 'Procaviidae belongs to Hyracoidea'
  • 'Prohyracodon belongs to Alloceropinae'
  • 'Prohyrax belongs to Pliohyracinae'
  • 'Propachynolophus belongs to Palaeotheriidae'
  • 'Propalaeotherium belongs to Palaeotheriidae'
  • 'Prosantorhinus belongs to Teleoceratini'
  • 'Protembolotherium belongs to Brontotheridae'
  • 'Protitan belongs to Brontotheridae'
  • 'Protitanops belongs to Brontotheridae'
  • 'Protitanotherium belongs to Telmatheriinae'
  • 'Protoaceratherium is corrected as Protaceratherium and belongs to Menoceratinae'
  • 'Protohippus (Calippus) was reranked as Calippus and belongs to Equini'
  • 'Protorohippus belongs to Equidae'
  • 'Pseudhipparion belongs to Hippotheriini'
  • 'Pseudopalaeotherium belongs to Palaeotheriidae'
  • 'Punjabitherium belongs to Rhinocerotoidea'
  • 'Radinskya belongs to Embrithopoda'
  • 'Rhadinorhinus belongs to Dolichorhininae'
  • 'Rhinocerina was reranked as the subtribe Rhinocerotina and belongs to Rhinocerotini'
  • 'Rhinoceros belongs to Rhinocerotina'
  • 'Rhinocerotidae belongs to Rhinocerotida'
  • 'Rhinocerotinae belongs to Rhinocerotidae'
  • 'Rhinocerotini belongs to Rhinocerotinae'
  • 'Rhinotapiromorpha belongs to Moropomorpha'
  • 'Rhinotitan belongs to Brontotheridae'
  • 'Ronzotherium belongs to Rhinocerotidae'
  • 'Saghatheriidae was reranked as the subfamily Saghatheriinae and belongs to Pliohyracidae'
  • 'Saghatherium belongs to Saghatheriinae'
  • 'Sastrilophus belongs to Isectolophidae'
  • 'Schizolophodon is a subjective synonym of Isectolophus'
  • 'Schizotheriinae belongs to Chalicotheriidae'
  • 'Schizotheriodes belongs to Lophiodontidae'
  • 'Seggeurius belongs to Geniohyinae'
  • 'Selenohyrax belongs to Saghatheriinae'
  • 'Sinohippus belongs to Anchitheriinae'
  • 'Sinotherium belongs to Elasmotheriina'
  • 'Sivatitanops belongs to Brontotheridae'
  • 'Soqdohyrax belongs to Pliohyracinae'
  • 'Sphenocoelus belongs to Brontotheridae'
  • 'Stephanorhinus belongs to Dicerorhinina'
  • 'Sterrohippus is a subjective synonym of Equus'
  • 'Sthenodectes belongs to Telmatheriinae'
  • 'Stylohipparion belongs to Hippotheriini'
  • 'Subchilotherium belongs to Aceratheriinae'
  • 'Subhyracodon belongs to Diceratheriinae'
  • 'Symborodon belongs to Brontotheridae'
  • 'Symphysorrhachis belongs to Rhinocerotoidea'
  • 'Systemodon belongs to Equoidea'
  • 'Tapiridea belongs to Ceratomorpha'
  • 'Tapiroidea belongs to Tapiridea'
  • 'Teilhardina is a subjective synonym of Caenolophus'
  • 'Teleoceras belongs to Teleoceratini'
  • 'Teleoceratini belongs to Rhinocerotinae'
  • 'Teleodus belongs to Telmatheriinae'
  • 'Teletaceras belongs to Rhinocerotidae'
  • 'Telmatheriinae belongs to Brontotheridae'
  • 'Telmatherium belongs to Telmatheriinae'
  • 'Tethytheria was reranked as a order and belongs to Altungulata'
  • 'Theria belongs to Mammalia'
  • 'Thyrohyrax belongs to Saghatheriinae'
  • 'Tichorhinus is a subjective synonym of Coelodonta'
  • 'Titanodectes belongs to Brontotheridae'
  • 'Titanohyrax belongs to Saghatheriinae'
  • 'Titanops is a subjective synonym of Megacerops'
  • 'Titanotheriomorpha was reranked as a infraorder and belongs to Perissodactyla'
  • 'Titanotherium belongs to Brontotheridae'
  • 'Toxotherium belongs to Lophiodontidae'
  • 'Trigonias belongs to Rhinocerotidae'
  • 'Triplopides belongs to Hyracodontinae'
  • 'Tylocephalonyx belongs to Schizotheriinae'
  • 'Ungulata was reranked as a superorder and belongs to Eutheria'
  • 'Xenicohippus belongs to Lambdotheriidae'