Opinions from H. E. Wood 1934

  • 'Chasmotheroides belongs to '
  • 'Ephyrachyus belongs to '
  • 'Ephyrachyus cristalophus belongs to Ephyrachyus'
  • 'Helaletes belongs to Tapiroidea'
  • 'Helaletes is a subjective synonym of Hyrachyus' according to Cope 1873
  • 'Helaletes belongs to Tapiroidea' according to Marsh 1872
  • 'Helaletes boops belongs to Helaletes'
  • 'Hyrachyus agrarius is a subjective synonym of Hyrachyus modestus'
  • 'Hyrachyus agrestis is a subjective synonym of Hyrachyus modestus'
  • 'Hyrachyus crassidens is a nomen dubium'
  • 'Hyrachyus douglassi belongs to Hyrachyus'
  • 'Hyrachyus eximius belongs to Hyrachyus'
  • 'Hyrachyus grande is corrected as Hyrachyus grandis and belongs to Hyrachyus'
  • 'Hyrachyus grande is corrected as Hyrachyus grandis and belongs to Hyrachyus' according to Hay 1930
  • 'Hyrachyus hypostylus belongs to Hyrachyus'
  • 'Hyrachyus imperialis is a subjective synonym of Hyrachyus princeps'
  • 'Hyrachyus implicatus is recombined as Ephyrachyus implicatus'
  • 'Hyrachyus intermedius is recombined as Chasmotheroides intermedius'
  • 'Hyrachyus obliquidens is recombined as Prothyracodon obliquidens'
  • 'Hyrachyus paradoxus is a nomen dubium'
  • 'Hyrachyus priscus is replaced by Hyrachyus douglassi'
  • 'Hyrachyus singularis is recombined as Heptodon singularis'
  • 'Hyrachyus singularis is recombined as Heptodon singularis' according to Matthew 1899
  • 'Hyrachyus singularis is recombined as Heptodon singularis' according to Cope 1887
  • 'Hyrachyus singularis is recombined as Pachynolophus singularis' according to Cope 1881
  • 'Lophiodon affinis is recombined as Hyrachyus affinis'
  • 'Lophiodon bairdianus is a subjective synonym of Hyrachyus modestus'
  • 'Lophiodon bairdianus is a subjective synonym of Hyrachyus eximius' according to Marsh 1899
  • 'Lophiodon modestus is recombined as Hyrachyus modestus'
  • 'Lophiodon modestus is recombined as Hyrachyus modestus' according to Leidy 1871
  • 'Lophiodon nanus is recombined as Helaletes nanus'
  • 'Lophiodon pumilus is recombined as Helohippus pumilus' according to Matthew 1899
  • 'Lophiodon pumilus is recombined as Hyrachyus pumilus' according to Leidy 1872
  • 'Lophiodon pumilus is recombined as Helaletes pumilus'
  • 'Lophiodon pumilus is recombined as Pachynolophus pumilus' according to Roger 1896
  • 'Metahyrachyus troxelli belongs to Metahyrachyus'
  • 'Systemodon is a subjective synonym of Hyracotherium'