Opinions from C. L. Gazin 1976
- 'Aelurotherium latidens is a subjective synonym of Patriofelis ferox'
- 'Anisacodon is a subjective synonym of Pantolestes'
- 'Anisacodon elegans is recombined as Pantolestes elegans'
- 'Antiacodon venustus belongs to Antiacodon'
- 'Apatemys bellulus belongs to Apatemys'
- 'Apatemys rodens belongs to Apatemys'
- 'Bathrodon annectens is recombined as Microsyops annectens'
- 'Centetodon altidens is recombined as Didelphodus altidens'
- 'Cynodontomys knightensis belongs to Cynodontomys'
- 'Cynodontomys latidens belongs to Cynodontomys'
- 'Diacodon bacchanalis is recombined as Centetodon bacchanalis'
- 'Diacodon bridgeri is recombined as Palaeictops bridgeri'
- 'Diacodon bridgeri is recombined as Palaeictops bridgeri' according to Van Valen 1967
- 'Diacodon edenensis is recombined as Scenopagus edenensis'
- 'Diacodon edenensis is recombined as Scenopagus edenensis' according to West 1973
- 'Dinoceras is a subjective synonym of Uintatherium'
- 'Dinoceras mirabile is a subjective synonym of Uintatherium anceps'
- 'Dromocyon is a subjective synonym of Synoplotherium'
- 'Dromocyon vorax is recombined as Synoplotherium vorax'
- 'Elotherium lentus is recombined as Helohyus lentus'
- 'Entomacodon angustidens is a subjective synonym of Nyctitherium serotinum'
- 'Harpalodon is a subjective synonym of Miacis'
- 'Harpalodon sylvestris is recombined as Miacis sylvestris'
- 'Helaletes belongs to Tapiroidea'
- 'Helaletes boops is a subjective synonym of Helaletes nanus'
- 'Helaletes latidens is recombined as Parisectolophus latidens'
- 'Helohippus is a subjective synonym of Orohippus'
- 'Herpetotherium is a subjective synonym of Peratherium'
- 'Herpetotherium marsupium is recombined as Peratherium marsupium'
- 'Hyopsodus gracilis is recombined as Smilodectes gracilis'
- 'Hypacodon is a subjective synonym of Centetodon'
- 'Hypacodon praecursor is a subjective synonym of Centetodon pulcher'
- 'Hyrachyus agrarius is a subjective synonym of Hyrachyus modestus'
- 'Hyrachyus agrestis is a subjective synonym of Hyrachyus modestus'
- 'Hyrachyus intermedius is recombined as Helaletes intermedius'
- 'Leurocephalus is a subjective synonym of Telmatherium'
- 'Leurocephalus cultridens is recombined as Telmatherium cultridens'
- 'Limnocyon agilis is recombined as Tritemnodon agilis'
- 'Limnocyon medius is recombined as Thinocyon medius'
- 'Limnocyon riparius is a subjective synonym of Limnocyon verus'
- 'Limnocyon verus belongs to Limnocyon'
- 'Limnofelis is a subjective synonym of Patriofelis'
- 'Limnofelis ferox is recombined as Patriofelis ferox'
- 'Limnofelis latidens is a subjective synonym of Patriofelis ferox'
- 'Limnohyus is a subjective synonym of Palaeosyops'
- 'Limnohyus laticeps is recombined as Limnohyops laticeps'
- 'Limnohyus robustus is recombined as Palaeosyops robustus'
- 'Limnotherium elegans is recombined as Microsyops elegans'
- 'Lophiodon affinis is recombined as Hyrachyus affinis'
- 'Lophiodon modestus is recombined as Hyrachyus modestus'
- 'Lophiodon nanus is recombined as Helaletes nanus'
- 'Lophiodon pumilus is recombined as Orohippus pumilus'
- 'Lophiotherium pygmaeum is recombined as Antiacodon pygmaeus'
- 'Lophiotherium sylvaticum is recombined as Orohippus sylvaticus'
- 'Microparamys wyomingensis belongs to Microparamys'
- 'Microsyops schlosseri belongs to Microsyops'
- 'Myolestes is a subjective synonym of Nyctitherium'
- 'Myolestes dasypelix is recombined as Nyctitherium dasypelix'
- 'Mysops fraternus belongs to Mysops'
- 'Nyctilestes is a subjective synonym of Nyctitherium'
- 'Nyctilestes serotinum is recombined as Nyctitherium serotinum'
- 'Nyctitherium curtidens is a subjective synonym of Scenopagus priscus'
- 'Nyctitherium priscus is recombined as Scenopagus priscus'
- 'Omomys ameghini is recombined as Uintanius ameghini'
- 'Oodectes proximus belongs to Oodectes'
- 'Oreocyon is a subjective synonym of Patriofelis'
- 'Palaeacodon verus is a subjective synonym of Microsyops elegans'
- 'Palaeosyops leidyi is a subjective synonym of Palaeosyops robustus'
- 'Palaeosyops major belongs to Palaeosyops'
- 'Pantolestes longieundus is corrected as Pantolestes longicaudus and belongs to Pantolestes'
- 'Paramys delicatior belongs to Paramys'
- 'Paramys delicatissimus is recombined as Reithroparamys delicatissimus'
- 'Paramys minutus is recombined as Microparamys minutus'
- 'Paramys robustus is recombined as Pseudotomus robustus'
- 'Paramys superbus is recombined as Ischyrotomus superbus'
- 'Parisectolophus belongs to '
- 'Scenopagus belongs to Dormaaliidae'
- 'Scenopagus mcgrewi is a subjective synonym of Scenopagus edenensis'
- 'Sciuravus belongs to Sciuravidae'
- 'Sciuravus parvidens is recombined as Tillomys parvidens'
- 'Sinopa grangeri is a subjective synonym of Sinopa major'
- 'Smilodectes belongs to Adapidae'
- 'Stypolophus bicuspis is recombined as Palaeictops bicuspis'
- 'Stypolophus pungens is recombined as Sinopa pungens'
- 'Taxymys belongs to Sciuravidae'
- 'Taxymys lucaris belongs to Taxymys'
- 'Telmalestes crassus is a subjective synonym of Notharctus robustior'
- 'Telmatotherium is a subjective synonym of Telmatherium'
- 'Telmatherium is corrected as Telmatotherium and belongs to ' according to Marsh 1880
- 'Thinocyon belongs to Limnocyonidae'
- 'Thinocyon minimus is a subjective synonym of Thinocyon mustelinus'
- 'Thinocyon velox belongs to Thinocyon'
- 'Thinotherium validum is recombined as Helohyus validus'
- 'Tillomys parvus is recombined as Mysops parvus'
- 'Tillotherium is a subjective synonym of Trogosus'
- 'Tillotherium fodiens is recombined as Tillodon fodiens'
- 'Tillotherium hyracoides is recombined as Trogosus hyracoides'
- 'Tillotherium latidens is recombined as Trogosus latidens'
- 'Titanotherium anceps is recombined as Uintatherium anceps'
- 'Uintamastix is a subjective synonym of Uintatherium'
- 'Uintamastix atrox is a subjective synonym of Uintatherium anceps'
- 'Uintanius turriculorum is a subjective synonym of Uintanius ameghini'
- 'Uintatherium robustum is a subjective synonym of Uintatherium anceps'
- 'Vulpavus hargeri is recombined as Miacis hargeri'