Opinions from A. E. Wood 1980
- 'Adjidaumo hansonorum is recombined as Paradjidaumo hansonorum'
- 'Adjidaumo hansonorum is recombined as Paradjidaumo hansonorum' according to Storer 1978
- 'Adjidaumo stewarti is recombined as Yoderimys stewarti'
- 'Adjidaumo stewarti is recombined as Yoderimys stewarti' according to Storer 1978
- 'Akmaiomys is a subjective synonym of Proheteromys'
- 'Akmaiomys incohatus is recombined as Proheteromys incohatus'
- 'Apletotomeus is a subjective synonym of Proheteromys'
- 'Apletotomeus crassus is recombined as Proheteromys crassus'
- 'Colotaxis is a subjective synonym of Ischyromys'
- 'Colotaxis is a subjective synonym of Ischyromys' according to Black 1968
- 'Colotaxis cristatus is a subjective synonym of Ischyromys typus'
- 'Colotaxis cristatus is a subjective synonym of Ischyromys typus' according to Black 1968
- 'Cupressimus belongs to Eomyidae' according to Storer 1978
- 'Cupressimus is a subjective synonym of Viejadjidaumo'
- 'Cupressimus barbarae is recombined as Viejadjidaumo barbarae'
- 'Cupressimus barbarae belongs to Cupressimus' according to Storer 1978
- 'Cylindrodon nebraskensis is a subjective synonym of Cylindrodon fontis'
- 'Diplolophus parvus is recombined as Proheteromys parvus'
- 'Eumys exiguus is recombined as Scottimus exiguus'
- 'Eumys latidens is a subjective synonym of Eumys cricetodontoides'
- 'Eumys minor is recombined as Paradjidaumo minor'
- 'Eumys spokanensis is a subjective synonym of Eumys cricetodontoides'
- 'Eumysops simplex is recombined as Simimys simplex'
- 'Gidleumys is a subjective synonym of Diplolophus'
- 'Gidleumys adspectans is a subjective synonym of Diplolophus insolens'
- 'Gymnoptychus is a subjective synonym of Ischyromys'
- 'Gymnoptychus is a subjective synonym of Ischyromys' according to Black 1968
- 'Gymnoptychus chrysodon is a subjective synonym of Ischyromys typus'
- 'Gymnoptychus chrysodon is a subjective synonym of Ischyromys typus' according to Black 1968
- 'Gymnoptychus minimus is recombined as Adjidaumo minimus'
- 'Gymnoptychus minutus is recombined as Adjidaumo minutus'
- 'Gymnoptychus nasutus is a subjective synonym of Paradjidaumo trilophus'
- 'Gymnoptychus trilophus is recombined as Paradjidaumo trilophus'
- 'Ischyromys douglassi is recombined as Titanotheriomys douglassi'
- 'Ischyromys parvidens belongs to Ischyromys'
- 'Ischyromys parvidens is a subjective synonym of Titanotheriomys veterior' according to Black 1968
- 'Ischyromys parvidens belongs to Ischyromys' according to Miller and Gidley 1920
- 'Ischyromys pliacus belongs to Ischyromys'
- 'Ischyromys pliacus belongs to Ischyromys' according to Troxell 1922
- 'Ischyromys troxelli belongs to Ischyromys'
- 'Ischyromys veterior is recombined as Titanotheriomys veterior'
- 'Leidymys vetus belongs to Leidymys'
- 'Paramys grangeri is a subjective synonym of Leptotomus leptodus'
- 'Paramys minutus is recombined as Microparamys minutus'
- 'Paramys relictus is recombined as Prosciurus relictus'
- 'Pipestoneomys pattersoni is a subjective synonym of Pipestoneomys bisulcatus'
- 'Prosciurus altidens is recombined as Plesispermophilus altidens'
- 'Prosciurus major is a subjective synonym of Leptotomus guildayi'
- 'Prosciurus major is a subjective synonym of Leptotomus guildayi' according to Storer 1978
- 'Prosciurus minor is a subjective synonym of Sciurus (Prosciurus) vetustus'
- 'Prosciurus minor is a subjective synonym of Sciurus (Prosciurus) vetustus' according to Storer 1978
- 'Prosciurus robustus is recombined as Mytonomys robustus'
- 'Prosciurus robustus is recombined as Mytonomys robustus' according to Black 1968
- 'Protadjidaumo burkei is recombined as Adjidaumo burkei'
- 'Protadjidaumo burkei is recombined as Adjidaumo burkei' according to Fahlbusch 1973
- 'Pseudocylindrodon sylvaticus is a subjective synonym of Pseudocylindrodon neglectus'
- 'Sciurus jeffersoni is recombined as Cedromus jeffersoni'
- 'Sciurus saskatchewaensis is recombined as Prosciurus saskatchewaensis'
- 'Steneofiber nebrascensis is recombined as Palaeocastor nebrascensis'
- 'Subsumus is a subjective synonym of Nonomys'
- 'Subsumus candelariae is a subjective synonym of Nonomys simplicidens'
- 'Titanotheriomys belongs to '
- 'Titanotheriomys wyomingensis is a subjective synonym of Titanotheriomys veterior'
- 'Titanotheriomys wyomingensis is a subjective synonym of Titanotheriomys veterior' according to Black 1968