Opinions from G. G. Simpson 1930

  • 'Amphicyon amnicola is a subjective synonym of Amphicyon sinapius'
  • 'Amphicyon pontoni belongs to Amphicyon'
  • 'Auchenia major is recombined as Megatylopus major'
  • 'Auchenia major is recombined as Procamelus major' according to Leidy and F. Lucas 1896
  • 'Auchenia major is recombined as Pliauchenia major' according to Cope 1892
  • 'Auchenia minimus is recombined as Procamelus minimus'
  • 'Auchenia minimus is recombined as Procamelus minimus' according to Leidy and F. Lucas 1896
  • 'Auchenia minimus is a subjective synonym of Pliauchenia minor' according to Cope 1892
  • 'Auchenia minor is a nomen dubium'
  • 'Dicotyles antiquus is recombined as Perchoerus antiquus'
  • 'Dicotyles antiquus belongs to Dicotyles' according to Marsh 1870
  • 'Hipparion phosphorum belongs to Hipparion'
  • 'Hippotherium ingenuum is recombined as Hipparion ingenuum'
  • 'Hippotherium ingenuum is recombined as Hipparion ingenuum' according to Hay 1930
  • 'Hippotherium plicatile is recombined as Hipparion plicatile'
  • 'Hippotherium princeps is a nomen dubium'
  • 'Hydrochoerus pinckneyi is recombined as Neochoerus pinckneyi'
  • 'Hydrochoerus pinckneyi is recombined as Neochoerus pinckneyi' according to Simpson 1929
  • 'Hydrochoerus pinckneyi is recombined as Neochoerus pinckneyi' according to Hay 1928
  • 'Hydrochoerus pinckneyi is recombined as Neochoerus pinckneyi' according to Hay 1927
  • 'Hydrochoerus pinckneyi belongs to Hydrochoerus' according to Hay 1923
  • 'Leptarctus progressus belongs to Leptarctus'
  • 'Mastodon rugosidens is recombined as Serridentinus rugosidens'
  • 'Mastodon rugosidens belongs to Mastodon' according to Leidy 1890
  • 'Merychippus gunteri belongs to Merychippus'
  • 'Merychippus isonesus secundus is recombined as Merychippus secundus'
  • 'Merychippus westoni belongs to Merychippus'
  • 'Pliomastodon sellardsi belongs to Pliomastodon'
  • 'Protocamelus virginiensis is recombined as Tanupolama virginiensis'
  • 'Protocamelus virginiensis is recombined as Camelops virginiensis' according to Hay 1929
  • 'Protocamelus virginiensis is recombined as Auchenia virginiensis' according to Leidy 1892
  • 'Protocamelus virginiensis belongs to Protocamelus' according to Leidy 1873
  • 'Rhinoceros longipes is recombined as Aphelops longipes'
  • 'Rhinoceros matutinus is recombined as Diceratherium matutinum'
  • 'Rhinoceros matutinus belongs to Rhinoceros' according to Marsh 1870
  • 'Rhinoceros proterus is recombined as Teleoceras proterus'