Opinions from B. J. Mader 2008
- 'Brontotheriinae belongs to Brontotheriidae'
- 'Diplacodon emarginatus is recombined as Protitanotherium emarginatum'
- 'Diplacodon progressum is recombined as Pseudodiplacodon progressum'
- 'Diploceras is replaced by Eotitanotherium'
- 'Diploceras osborni is recombined as Eotitanotherium osborni'
- 'Dolichorhinae is corrected as Dolichorhininae and belongs to Brontotheriidae'
- 'Dolichorhinoides is a subjective synonym of Sphenocoelus'
- 'Dolichorhinus is a subjective synonym of Sphenocoelus'
- 'Dolichorhinus fluminalis is a subjective synonym of Sphenocoelus intermedius'
- 'Dolichorhinus heterodon is a subjective synonym of Sphenocoelus intermedius'
- 'Dolichorhinus intermedius is recombined as Sphenocoelus intermedius'
- 'Dolichorhinus longiceps is a subjective synonym of Sphenocoelus hyognathus'
- 'Eotitanotherium belongs to Brontotheriinae'
- 'Heterotitanops is a subjective synonym of Metarhinus'
- 'Leurocephalus is a subjective synonym of Telmatherium'
- 'Telmatherium cultridens is a subjective synonym of Telmatherium validus'
- 'Manteoceras is a subjective synonym of Telmatherium'
- 'Manteoceras uintensis is a subjective synonym of Metatelmatherium ultimum'
- 'Telmatherium washakiensis is a subjective synonym of Telmatherium validus'
- 'Mesatirhinus belongs to Dolichorhininae'
- 'Mesatirhinus petersoni is a subjective synonym of Mesatirhinus megarhinus'
- 'Mesatirhinus superior is a subjective synonym of Sphenocoelus intermedius'
- 'Metarhinus belongs to Dolichorhininae'
- 'Metarhinus fluviatilis belongs to Metarhinus'
- 'Metarhinus pater is a subjective synonym of Metarhinus diploconus'
- 'Metarhinus riparius is a subjective synonym of Metarhinus fluviatilis'
- 'Metatelmatherium belongs to Brontotheriidae'
- 'Metatelmatherium cristatum belongs to Metatelmatherium'
- 'Palaeosyops hyognathus is recombined as Sphenocoelus hyognathus'
- 'Mesatirhinus junius is a nomen dubium'
- 'Telmatherium manteoceras is a subjective synonym of Telmatherium validus'
- 'Palaeosyops megarhinus is recombined as Mesatirhinus megarhinus'
- 'Protitanotherium belongs to Brontotheriinae'
- 'Pseudodiplacodon belongs to Brontotheriinae'
- 'Rhadinorhininae is a subjective synonym of Dolichorhininae'
- 'Rhadinorhinus is a subjective synonym of Metarhinus'
- 'Sphenocoelus belongs to Dolichorhininae'
- 'Sphenocoelus uintensis belongs to Sphenocoelus'
- 'Sthenodectes belongs to Brontotheriidae'
- 'Tanyorhinus is a subjective synonym of Sphenocoelus'
- 'Sphenocoelus blairi is a subjective synonym of Sphenocoelus uintensis'
- 'Sphenocoelus bridgeri is a subjective synonym of Sphenocoelus uintensis'
- 'Sphenocoelus harundivoras is a subjective synonym of Sphenocoelus uintensis'
- 'Telmatherium belongs to Brontotheriinae'
- 'Telmatotherium is a subjective synonym of Telmatherium'
- 'Telmatherium incisivum is recombined as Sthenodectes incisivum'
- 'Telmatherium ultimum is recombined as Metatelmatherium ultimum'
- 'Telmatherium validus belongs to Telmatherium'
- 'Sphenocoelus cornutum is a subjective synonym of Sphenocoelus hyognathus'
- 'Telmatotherium diploconum is recombined as Metarhinus diploconus'