Opinions from S. R. May 2019
- 'Aelurodon belongs to Aelurodontina'
- 'Aelurodon taxoides belongs to Aelurodon'
- 'Aepycamelus belongs to Lamini'
- 'Apalone belongs to Trionychidae'
- 'Astrohippus curtivallis is recombined as Pseudhipparion curtivallum'
- 'Blancotherium belongs to Gomphotheriidae'
- 'Calippus martini belongs to Calippus'
- 'Calippus regulus belongs to Calippus'
- 'Canis vafer is recombined as Leptocyon vafer'
- 'Ceratogaulus rhinocerus [misspelled as Ceratogaulus rhinoceros] belongs to Ceratogaulus'
- 'Cormohipparion belongs to Hipparionini'
- 'Cosoryx ramosus is recombined as Ramoceros ramosus'
- 'Cosoryx teres is recombined as Cranioceras teres'
- 'Cranioceras belongs to Cranioceratini'
- 'Crocodilus mississippiensis is recombined as Alligator mississippiensis'
- 'Dinocyon gidleyi is recombined as Ischyrocyon gidleyi'
- 'Domninoides belongs to Talpidae'
- 'Equus (Protohippus) was reranked as Protohippus and belongs to Equini'
- 'Eucyon belongs to Caninae'
- 'Gnathabelodon buckneri is recombined as Blancotherium buckneri'
- 'Gopherus belongs to Testudinidae'
- 'Hipparion belongs to Hipparionini'
- 'Hipparion (Nannippus) was reranked as Nannippus and belongs to Hipparionini'
- 'Hipparion affine is recombined as Neohipparion affine'
- 'Hipparion occidentale is recombined as Cormohipparion occidentale'
- 'Hippotherium ingenuum is recombined as Cormohipparion ingenuum'
- 'Hippotigris clarendonensis is a subjective synonym of Protohippus supremus'
- 'Hippotigris parastylus is a subjective synonym of Protohippus supremus'
- 'Hippotigris sellardsi is a subjective synonym of Protohippus supremus'
- 'Hypolagus apachensis is recombined as Pronotolagus apachensis'
- 'Ictalurus belongs to Ictaluridae'
- 'Ischyrocyon belongs to Amphicyoninae'
- 'Lepisosteus belongs to Lepisosteidae'
- 'Leptocyon belongs to Caninae'
- 'Merychyus medius is recombined as Ustatochoerus medius'
- 'Mycteria belongs to Ciconiidae'
- 'Neohipparion belongs to Hipparionini'
- 'Neohipparion gratum tehonense is recombined as Hipparion tehonense'
- 'Nothotylopus belongs to Miolabinae'
- 'Nothotylopus camptognathus belongs to Nothotylopus'
- 'Perognathus minutus belongs to Perognathus'
- 'Pliohippus pernix belongs to Pliohippus'
- 'Procamelus belongs to Camelini'
- 'Procamelus coartatus is recombined as Protolabis coartatus'
- 'Procamelus grandis belongs to Procamelus'
- 'Procamelus occidentalis belongs to Procamelus'
- 'Protohippus (Calippus) was reranked as Calippus and belongs to Equini'
- 'Protohippus placidus is recombined as Calippus placidus'
- 'Protohippus supremus belongs to Protohippus'
- 'Protolabis belongs to Protolabinae'
- 'Protolabis notiochorinus is a subjective synonym of Protolabis coartatus'
- 'Pseudhipparion belongs to Hipparionini'
- 'Pseudoceras belongs to Pseudoceratinae'
- 'Pseudoceras skinneri belongs to Pseudoceras'
- 'Ramoceros belongs to Merycodontinae'
- 'Synthetoceras belongs to Synthetoceratinae'
- 'Synthetoceras tricornatus belongs to Synthetoceras'
- 'Teleoceras belongs to Teleoceratini'
- 'Teleoceras major belongs to Teleoceras'
- 'Terrapene belongs to Emydidae'
- 'Testudo (Hesperotestudo) was reranked as Hesperotestudo and belongs to Testudinidae'
- 'Trachemys belongs to Emydidae'
- 'Ustatochoerus belongs to Ustatochoerinae'