Opinions from D. B. Wright 1998
- 'Bothrolabis rostratus is a nomen dubium'
- 'Chaenohyus is a subjective synonym of Thinohyus' according to Sinclair 1905
- 'Chaenohyus is a nomen dubium'
- 'Chaenohyus decedens is a nomen dubium'
- 'Cynorca is a nomen dubium'
- 'Cynorca proterva is a nomen dubium'
- 'Desmathyus is a subjective synonym of Hesperhys' according to Simpson 1945
- 'Desmathyus is a subjective synonym of Hesperhys'
- 'Desmathyus brachydontus is recombined as Catagonus brachydontus'
- 'Desmathyus pinensis is recombined as Hesperhys pinensis'
- 'Desmathyus validus is a subjective synonym of Hesperhys vagrans'
- 'Desmathyus validus belongs to Desmathyus' according to Matthew 1932
- 'Dicotyles fossilis is recombined as Mylohyus fossilis'
- 'Dicotyles serus is recombined as Prosthennops serus'
- 'Dyseohyus stirtoni is a subjective synonym of Prosthennops xiphodonticus'
- 'Floridachoerus belongs to Tayassuidae'
- 'Floridachoerus olseni belongs to Floridachoerus'
- 'Hyotherium americanum is a nomen dubium'
- 'Hyotherium americanum belongs to Hyotherium' according to Scott and Osborn 1887
- 'Macrogenis belongs to Tayassuidae'
- 'Palaeochoerus probus is recombined as Perchoerus probus'
- 'Palaeochoerus subaequans is a nomen dubium'
- 'Palaeochoerus subaequans is recombined as Perchoerus subaequans' according to Matthew 1915
- 'Perchoerus minor is a nomen dubium'
- 'Perchoerus minor belongs to Perchoerus' according to Cook 1922
- 'Platygonus rex is a nomen dubium'
- 'Prosthennops brachirostris is recombined as Platygonus brachirostris'
- 'Prosthennops crassigenis is recombined as Macrogenis crassigenis'
- 'Prosthennops edensis is recombined as Tayassu edensis'
- 'Prosthennops elmorei is recombined as Mylohyus elmorei'
- 'Prosthennops kernensis is a nomen dubium'
- 'Prosthennops longirostris belongs to Prosthennops' according to Thorpe 1924
- 'Prosthennops longirostris is recombined as Mylohyus longirostris'
- 'Prosthennops niobrarensis belongs to Prosthennops'
- 'Prosthennops oregonensis is recombined as Platygonus oregonensis'
- 'Prosthennops xiphodonticus belongs to Prosthennops'
- 'Thinohyus belongs to Tayassuidae'
- 'Thinohyus lentus belongs to Thinohyus'
- 'Thinohyus nanus is a nomen dubium'
- 'Thinohyus osmonti is a nomen dubium'
- 'Thinohyus socialis is recombined as Cynorca sociale'