Opinions from C. L. Gazin 1958
- 'Anaptomorphus homunculus is recombined as Tetonius homunculus'
- 'Anaptomorphus wortmani belongs to Anaptomorphus'
- 'Anemorhysis belongs to Omomyidae'
- 'Apatemys downsi belongs to Apatemys'
- 'Aphanolemur is a subjective synonym of Smilodectes'
- 'Aphanolemur gibbosus is a subjective synonym of Smilodectes gracilis'
- 'Chlororhysis belongs to Omomyidae'
- 'Chlororhysis knightensis belongs to Chlororhysis'
- 'Euryacodon is a subjective synonym of Omomys'
- 'Euryacodon belongs to ' according to Marsh 1872
- 'Euryacodon lepidus is a subjective synonym of Omomys carteri'
- 'Hemiacodon nanus is a subjective synonym of Omomys carteri'
- 'Hemiacodon pucillus is a subjective synonym of Omomys carteri'
- 'Hemiacodon pygmaeus is a subjective synonym of Washakius insignis'
- 'Hipposyus is a subjective synonym of Notharctus'
- 'Hipposyus formosus is a subjective synonym of Notharctus tenebrosus'
- 'Hyopsodus gracilis is recombined as Smilodectes gracilis'
- 'Limnotherium is a subjective synonym of Notharctus'
- 'Limnotherium affine is a subjective synonym of Notharctus tenebrosus'
- 'Limnotherium elegans is recombined as Microsyops elegans'
- 'Limnotherium tyrannus is a subjective synonym of Notharctus tenebrosus'
- 'Microsyops uintensis is recombined as Ourayia uintensis'
- 'Notharctus matthewi is a subjective synonym of Smilodectes gracilis'
- 'Notharctus minutus is recombined as Omomys minutus'
- 'Notharctus osborni is a subjective synonym of Notharctus tenebrosus'
- 'Notharctus pugnax is a subjective synonym of Notharctus tenebrosus'
- 'Nothodectes is a subjective synonym of Plesiadapis'
- 'Nothodectes dubius is recombined as Plesiadapis dubius'
- 'Omomys ameghini is recombined as Uintanius ameghini'
- 'Omomys ameghini is recombined as Uintanius ameghini' according to Matthew 1915
- 'Omomys lloydi belongs to Omomys'
- 'Opisthotomus is a subjective synonym of Phenacodus'
- 'Ourayia belongs to Omomyidae'
- 'Palaeacodon vagus is a subjective synonym of Omomys carteri'
- 'Pantolestes longieundus is corrected as Pantolestes longicaudus and belongs to Pantolestes'
- 'Paratetonius is a subjective synonym of Tetonius'
- 'Paratetonius belongs to ' according to Seton 1940
- 'Paratetonius steini is a subjective synonym of Tetonius homunculus'
- 'Paratetonius steini belongs to Paratetonius' according to Seton 1940
- 'Paratetonius sublettensis is recombined as Anemorhysis sublettensis'
- 'Pelycodus belongs to Adapidae'
- 'Pelycodus relictus is a subjective synonym of Smilodectes gracilis'
- 'Prototomus jarrovii is recombined as Pelycodus jarrovii'
- 'Sarcolemur is a subjective synonym of Antiacodon'
- 'Smilodectes belongs to Adapidae'
- 'Stehlinius is a subjective synonym of Stehlinella'
- 'Stehlinius uintensis is recombined as Stehlinella uintensis'
- 'Stockia belongs to Omomyidae'
- 'Stockia powayensis belongs to Stockia'
- 'Telmalestes is a subjective synonym of Notharctus'
- 'Tetonius barbeyi belongs to Tetonius' according to Seton 1940
- 'Tetonius barbeyi is a subjective synonym of Loveina zephyri'
- 'Tetonius musculus is recombined as Anemorhysis musculus'
- 'Thinolestes is a subjective synonym of Notharctus'
- 'Thinolestes anceps is a subjective synonym of Notharctus tenebrosus'
- 'Tomitherium is a subjective synonym of Notharctus'
- 'Tomitherium rostratum is a subjective synonym of Notharctus tenebrosus'
- 'Trogolemur myodes belongs to Trogolemur'
- 'Uintalacus belongs to Omomyidae'
- 'Uintalacus nettingi belongs to Uintalacus'
- 'Uintanius turriculorum is a subjective synonym of Uintanius ameghini'
- 'Uintasorex parvulus belongs to Uintasorex'
- 'Utahia belongs to Omomyidae'
- 'Utahia kayi belongs to Utahia'
- 'Washakius belongs to Omomyidae'
- 'Washakius is a subjective synonym of Anaptomorphus' according to Cope 1877
- 'Yumanius is a subjective synonym of Washakius'
- 'Yumanius woodringi is recombined as Washakius woodringi'