Opinions from J. R. Macdonald 1970
- 'Allomys sharpi belongs to Allomys'
- 'Amphicyon angustidens is recombined as Hesperocyon angustidens'
- 'Anchippus is a subjective synonym of Parahippus'
- 'Anchippus texanus is recombined as Parahippus texanus'
- 'Anchitherium equiceps is recombined as Miohippus equiceps'
- 'Ancodon leptodus is recombined as Arretotherium leptodus'
- 'Blastomeryx advena belongs to Blastomeryx'
- 'Brachyrhynchocyon douglasi belongs to Brachyrhynchocyon'
- 'Canis geismarianus is recombined as Nothocyon geismarianus'
- 'Canis gregarius is recombined as Hesperocyon gregarius'
- 'Canis lemur is recombined as Nothocyon lemur'
- 'Chaenohyus decedens belongs to Chaenohyus'
- 'Cynodesmus minor is recombined as Nothocyon minor'
- 'Cynodesmus thomsoni is recombined as Tomarctus thomsoni'
- 'Cynodictis paterculus is recombined as Hesperocyon paterculus'
- 'Diceratherium gregorii belongs to Diceratherium'
- 'Dinictis eileenae belongs to Dinictis'
- 'Domnina dakotensis belongs to Domnina'
- 'Domninoides evelynae is recombined as Proscalops evelynae'
- 'Downsimus belongs to Allomyidae'
- 'Downsimus chadwicki belongs to Downsimus'
- 'Ekgmowechashala belongs to Omomyidae'
- 'Ekgmowechashala philotau belongs to Ekgmowechashala'
- 'Elomeryx garbanii belongs to Elomeryx'
- 'Entoptychus curtus is recombined as Gregorymys curtus'
- 'Entoptychus formosus is recombined as Gregorymys formosus'
- 'Euhapsis gaulodon is a subjective synonym of Capatanka brachyceps'
- 'Eumys gloveri belongs to Eumys'
- 'Galecynus latidens is recombined as Nothocyon latidens'
- 'Gentilicamelus wyomingensis is recombined as Oxydactylus wyomingensis' according to McKenna 1966
- 'Gentilicamelus wyomingensis is recombined as Oxydactylus wyomingensis'
- 'Grangerimus harkseni belongs to Grangerimus'
- 'Hoplophoneus platycopis is recombined as Dinictis platycopis'
- 'Hoplophoneus platycopis is recombined as Dinictis platycopis' according to Adams 1896
- 'Hyaenodon brevirostrus belongs to Hyaenodon'
- 'Hypertragulus ordinatus is recombined as Nanotragulus ordinatus'
- 'Hypolagus primitivus is recombined as Megalagus primitivus'
- 'Hypselochoerus is a subjective synonym of Desmatochoerus'
- 'Leptauchenia nitida is recombined as Sespia nitida'
- 'Lepus macrocephalus is recombined as Archaeolagus macrocephalus'
- 'Lepus primigenius is recombined as Archaeolagus primigenius'
- 'Machaerodus brachyops is recombined as Nimravus brachyops'
- 'Macrorhineura belongs to Amphisbaenidae'
- 'Macrorhineura skinneri belongs to Macrorhineura'
- 'Meniscomys milleri belongs to Meniscomys'
- 'Merychyus curtus is recombined as Oreodontoides curtus'
- 'Merychyus delicatus is a subjective synonym of Merychyus minimus'
- 'Mesocyon geringensis is recombined as Sunkahetanka geringensis'
- 'Mustelavus priscus is recombined as Plesictis priscus'
- 'Mylagaulodon belongs to Mylagaulidae'
- 'Mylagaulodon angulatus belongs to Mylagaulodon'
- 'Nothocyon gregorii is recombined as Hesperocyon gregorii'
- 'Nothocyon leptodus is recombined as Hesperocyon leptodus'
- 'Nothocyon vulpinus is recombined as Cynodesmus vulpinus'
- 'Oligobunis gemmarosae is recombined as Promartes gemmarosae'
- 'Oligobunis lepidus is recombined as Promartes lepidus'
- 'Pachycynodon delicatus is recombined as Neocynodesmus delicatus'
- 'Paciculus mcgregori belongs to Paciculus'
- 'Palaeoerinaceus horncloudi belongs to Palaeoerinaceus'
- 'Palaeoscalopus belongs to Talpidae'
- 'Palaeoscalopus pineridgensis belongs to Palaeoscalopus'
- 'Parahippus pristinus belongs to Parahippus'
- 'Pleurolicus clasoni is recombined as Sanctimus clasoni'
- 'Pogonodon is a subjective synonym of Dinictis' according to Adams 1896
- 'Pogonodon is a subjective synonym of Dinictis'
- 'Promerycochoerus (Desmatochoerus) curvidens is recombined as Desmatochoerus curvidens'
- 'Promerycochoerus gregoryi is a subjective synonym of Desmatochoerus curvidens'
- 'Promerycochoerus hatcheri is recombined as Desmatochoerus hatcheri'
- 'Promerycochoerus hollandi is recombined as Megoreodon hollandi'
- 'Promerycochoerus minor belongs to Promerycochoerus'
- 'Promerycochoerus pygmyus is a subjective synonym of Promerycochoerus minor'
- 'Pseudocynodictis is a subjective synonym of Hesperocyon'
- 'Quadrodens belongs to Talpidae'
- 'Quadrodens wilsoni belongs to Quadrodens'
- 'Sanctimus belongs to Florentiamyidae'
- 'Sanctimus stuartae belongs to Sanctimus'
- 'Sanctimus tiptoni belongs to Sanctimus'
- 'Steneofiber brachyceps is recombined as Capatanka brachyceps'
- 'Steneofiber gradatus is recombined as Capacikala gradatus'
- 'Steneofiber nebrascensis is recombined as Palaeocastor nebrascensis'
- 'Steneofiber sciuroides is recombined as Capacikala sciuroides'
- 'Steneofiber simplicidens is recombined as Palaeocastor simplicidens'