Opinions from L. Van Valen 1966
- 'Aelurotherium is a subjective synonym of Patriofelis'
- 'Avunculus belongs to Cimolestidae'
- 'Avunculus didelphodonti belongs to Avunculus'
- 'Centetodon altidens is recombined as Didelphodus altidens'
- 'Cimolestes curtus is recombined as Diaphorodon curtus'
- 'Clinodon is a subjective synonym of Clinopternodus'
- 'Clinodon is a subjective synonym of Clinopternodus' according to Clark 1937
- 'Clinodon belongs to Micropternodontidae' according to Clark 1936
- 'Clinodon gracilis is recombined as Clinopternodus gracilis'
- 'Clinodon gracilis is recombined as Clinopternodus gracilis' according to Clark 1937
- 'Clinodon gracilis belongs to Clinodon' according to Clark 1936
- 'Deltatherium absarokae is recombined as Didelphodus absarokae'
- 'Didelphodus ventanus is a subjective synonym of Didelphodus altidens'
- 'Dipsalidictis is a subjective synonym of Oxyaena'
- 'Dipsalidictis platypus is recombined as Oxyaena platypus'
- 'Emperodon is a subjective synonym of Gelastops'
- 'Emperodon acmeodontoides is a subjective synonym of Gelastops parcus'
- 'Entomodon comptus is recombined as Thinocyon comptus'
- 'Hyaenodon horridus belongs to Hyaenodon'
- 'Ischnognathus is a nomen vanum'
- 'Ischnognathus savagei is a nomen vanum'
- 'Kentrogomphios is a subjective synonym of Micropternodus'
- 'Limnofelis is a subjective synonym of Patriofelis'
- 'Limnotherium is a subjective synonym of Notharctus'
- 'Lipodectes is a subjective synonym of Deltatherium'
- 'Neohyaenodon is a subjective synonym of Hyaenodon'
- 'Oreocyon is a subjective synonym of Patriofelis'
- 'Oxyaena simpsoni belongs to Oxyaena'
- 'Oxyaena transiens is a subjective synonym of Oxyaena gulo'
- 'Oxyaenodon dysclerus is a subjective synonym of Oxyaenodon dysodus'
- 'Oxyaenodon wortmani belongs to Oxyaenodon'
- 'Palaeoryctes punctatus belongs to Palaeoryctes'
- 'Pararyctes belongs to Cimolesta'
- 'Pararyctes pattersoni belongs to Pararyctes'
- 'Phenacops is a subjective synonym of Didelphodus'
- 'Phenacops incerta is a subjective synonym of Didelphodus altidens'
- 'Prolimnocyon belongs to Limnocyonidae'
- 'Prototomus belongs to Hyaenodontidae'
- 'Proviverra americana is a nomen dubium'
- 'Stypolophus is a subjective synonym of Sinopa'
- 'Telmalestes is a subjective synonym of Notharctus'
- 'Telmatocyon is a subjective synonym of Limnocyon'
- 'Telmatocyon belongs to ' according to Marsh 1899
- 'Thinolestes is a subjective synonym of Notharctus'
- 'Tomitherium is a subjective synonym of Notharctus'
- 'Triacodon is a nomen dubium'
- 'Triacodon fallax is a nomen dubium'
- 'Ziphacodon is a nomen dubium'
- 'Ziphacodon rugatus is a nomen dubium'