Opinions from D. R. Prothero and R. M. Schoch 1989
- 'Acrocodia is a subjective synonym of Tapirus'
- 'Amynodon belongs to Amynodontidae'
- 'Amynodontidae belongs to Rhinocerotoidea'
- 'Amynodontopsis belongs to Cadurcodontinae'
- 'Aralotherium is a subjective synonym of Paraceratherium'
- 'Baluchitherium is a subjective synonym of Paraceratherium'
- 'Benaratherium belongs to Indricotheriinae'
- 'Breviodon belongs to Ceratomorpha'
- 'Cadurcamynodon is a subjective synonym of Cadurcotherium'
- 'Cadurcodon belongs to Cadurcodontinae'
- 'Cadurcodontini was reranked as the subfamily Cadurcodontinae and belongs to Amynodontidae'
- 'Cadurcopsis is a subjective synonym of Metamynodon'
- 'Cadurcotherium belongs to Metamynodontinae'
- 'Caenolophus belongs to Amynodontidae'
- 'Ceratomorpha was reranked as a unranked clade and belongs to Moropomorpha'
- 'Chasmotherium belongs to Rhinocerotoidea'
- 'Chasmotheroides is a subjective synonym of Helaletes'
- 'Cinchacus is a subjective synonym of Tapirus'
- 'Colodon belongs to Tapiroidea'
- 'Cristidentinus is a subjective synonym of Deperetella'
- 'Deperetella belongs to Deperetellidae'
- 'Deperetellidae belongs to Deperetellidea'
- 'Deperetellidea belongs to Ceratomorpha'
- 'Desmatotherium belongs to Ceratomorpha'
- 'Dilophodon belongs to Ceratomorpha'
- 'Diplolophodon is a subjective synonym of Deperetella'
- 'Dzungariotherium is a subjective synonym of Paraceratherium'
- 'Elasmognathus is a subjective synonym of Tapirus'
- 'Eoletes belongs to Eoletidae'
- 'Eoletidae belongs to Lophialetidea'
- 'Eotapirus belongs to Tapiridae'
- 'Ephyrachyus is a subjective synonym of Hyrachyus'
- 'Euryodon is a subjective synonym of Caenolophus'
- 'Forstercooperia belongs to Indricotheriinae'
- 'Gigantamynodon belongs to Amynodontidae'
- 'Guixia is a subjective synonym of Juxia'
- 'Haagella belongs to Tapiroidea'
- 'Helaletes belongs to Tapiroidea'
- 'Heptodon belongs to Tapiridea'
- 'Huananodon belongs to Amynodontidae'
- 'Hypsamynodon is a subjective synonym of Cadurcotherium'
- 'Hyrachyus belongs to Rhinocerotoidea'
- 'Hyracodontidae belongs to Rhinocerotida'
- 'Hyracodontinae belongs to Hyracodontidae'
- 'Imequincisoria is a subjective synonym of Juxia'
- 'Indricotheriidae was reranked as the subfamily Indricotheriinae and belongs to Hyracodontidae'
- 'Indricotherium belongs to Indricotheriinae'
- 'Juxia belongs to Indricotheriinae'
- 'Lophialetes belongs to Lophialetidae'
- 'Lophialetidae belongs to Lophialetidea'
- 'Lophialetidea belongs to Ceratomorpha'
- 'Lushiamynodon is a subjective synonym of Sharamynodon'
- 'Megalamynodon belongs to Metamynodontinae'
- 'Mesamynodon belongs to Amynodontidae'
- 'Mesotapirus is a subjective synonym of Colodon'
- 'Metamynodontinae belongs to Amynodontidae'
- 'Miotapirus belongs to Tapiridae'
- 'Orthocynodon is a subjective synonym of Amynodon'
- 'Palaeotapirus belongs to Tapiridae'
- 'Pappaceras is a subjective synonym of Forstercooperia'
- 'Parabreviodon belongs to Ceratomorpha'
- 'Paracadurcodon is a subjective synonym of Cadurcodon'
- 'Paraceratherium belongs to Indricotheriinae'
- 'Paracolodon is a subjective synonym of Colodon'
- 'Paramynodon belongs to Metamynodontinae'
- 'Parisectolophus is a subjective synonym of Isectolophus'
- 'Pataecops belongs to Rhodopagidae'
- 'Pinchacus is a subjective synonym of Tapirus'
- 'Plesiocolopirus belongs to Tapiroidea'
- 'Procadurcodon belongs to Amynodontidae'
- 'Protapirus belongs to Tapiridae'
- 'Rhinocerotida belongs to Ceratomorpha'
- 'Rhinocerotoidea is a subjective synonym of Tapiridea'
- 'Rhinochoerus is a subjective synonym of Tapirus'
- 'Rhodopagidae belongs to Deperetellidea'
- 'Rhodopagus belongs to Rhodopagidae'
- 'Rostriamynodon belongs to Amynodontidae'
- 'Schlosseria belongs to Lophialetidae'
- 'Selenaletes belongs to Ceratomorpha'
- 'Sharamynodon belongs to Cadurcodontinae'
- 'Sianodon belongs to Cadurcodontinae'
- 'Simplaletes belongs to Lophialetidae'
- 'Syspotamus is a subjective synonym of Tapirus'
- 'Taperidae is corrected as Tapiridae and belongs to Tapiroidea'
- 'Tapir is a subjective synonym of Tapirus'
- 'Tapiravus belongs to Tapiridae'
- 'Tapirella is a subjective synonym of Tapirus'
- 'Tapiriscus belongs to Tapiridae'
- 'Tapirus belongs to Tapiridae'
- 'Tapirus (Megatapirus) was reranked as Megatapirus and belongs to Tapiridae'
- 'Tapyra is a subjective synonym of Tapirus'
- 'Teilhardina is a subjective synonym of Caenolophus'
- 'Teleolophus belongs to Deperetellidae'
- 'Thaumastotherium is a subjective synonym of Paraceratherium'
- 'Triplopus belongs to Hyracodontinae'
- 'Urtinotherium belongs to Amynodontidae'
- 'Veragromovia is a subjective synonym of Helaletes'
- 'Zaisanamynodon belongs to Metamynodontinae'