Opinions from D. R. Prothero 1998
- 'Aceratheriinae belongs to Rhinocerotidae'
- 'Aceratherium megalodum is recombined as Aphelops megalodus'
- 'Aceratherium platycephalum is recombined as Amphicaenopus platycephalus'
- 'Aceratherium tridactylum is recombined as Diceratherium tridactylum'
- 'Amphicaenopus belongs to Rhinocerotidae'
- 'Aphelops belongs to Aceratheriinae'
- 'Aphelops ceratorhinus is a subjective synonym of Peraceras superciliosum'
- 'Aphelops montanus is a subjective synonym of Peraceras profectum'
- 'Aphelops montanus is a subjective synonym of Aphelops ceratorhinus' according to Sutton 1977
- 'Brachypotherium belongs to Teleoceratini'
- 'Caenopus is a subjective synonym of Subhyracodon'
- 'Caenopus dakotensis is recombined as Penetrigonias dakotensis'
- 'Diceratheriinae belongs to Rhinocerotidae'
- 'Diceratherium belongs to Diceratheriinae'
- 'Diceratherium arikarense is recombined as Menoceras arikarense'
- 'Diceratherium avum is a subjective synonym of Diceratherium tridactylum'
- 'Diceratherium cooki is a subjective synonym of Menoceras arikarense'
- 'Diceratherium jamberi is a subjective synonym of Peraceras profectum'
- 'Diceratherium proavitum is a subjective synonym of Diceratherium tridactylum'
- 'Eotrigonias mortivallis is recombined as Teletaceras mortivallis'
- 'Floridaceras belongs to Aceratheriinae'
- 'Menoceras belongs to Menoceratinae'
- 'Menoceras falkenbachi is a subjective synonym of Menoceras barbouri'
- 'Menoceras marslandensis is a subjective synonym of Menoceras barbouri'
- 'Menoceratinae belongs to Rhinocerotidae'
- 'Moschoedestes is a subjective synonym of Menoceras'
- 'Moschoedestes delahoensis is a subjective synonym of Menoceras barbouri'
- 'Penetrigonias belongs to Rhinocerotidae'
- 'Peraceras belongs to Aceratheriinae'
- 'Peraceras troxelli is a subjective synonym of Peraceras superciliosum'
- 'Rhinoceros crassus is a subjective synonym of Peraceras superciliosum'
- 'Rhinoceros matutinus is a subjective synonym of Diceratherium armatum'
- 'Rhinoceros occidentalis is recombined as Subhyracodon occidentalis'
- 'Subhyracodon belongs to Diceratheriinae'
- 'Subhyracodon metalophum is a subjective synonym of Diceratherium tridactylum'
- 'Subhyracodon sagittatus is recombined as Penetrigonias sagittatus'
- 'Teleoceras belongs to Teleoceratini'
- 'Teleoceras ocotensis is a subjective synonym of Teleoceras hicksi'
- 'Teleoceratinae belongs to Rhinocerotidae'
- 'Teleoceratini belongs to Teleoceratinae'
- 'Teletaceras belongs to Rhinocerotidae'
- 'Trigonias belongs to Rhinocerotidae'
- 'Trigonias wellsi belongs to Trigonias'