Opinions from G. G. Simpson 1940
- 'Absarokius belongs to Anaptomorphinae'
- 'Adapidae belongs to Primates'
- 'Adapinae belongs to Adapidae'
- 'Adapis belongs to Adapinae'
- 'Amphichiromys is a subjective synonym of Heterohyus'
- 'Anagale belongs to Primates'
- 'Anaptomorphidae belongs to Primates'
- 'Anaptomorphinae belongs to Anaptomorphidae'
- 'Anaptomorphus belongs to Anaptomorphinae'
- 'Anchomomys belongs to Adapinae'
- 'Apatemyidae belongs to Primates'
- 'Apatemys belongs to Apatemyidae'
- 'Aphanolemur belongs to Adapidae'
- 'Caenopithecus belongs to Adapidae'
- 'Carpodaptes belongs to Carpolestidae'
- 'Carpolestes belongs to Carpolestidae'
- 'Carpolestidae belongs to Primates'
- 'Ceciliolemur belongs to Primates'
- 'Ceciliolemuridae is an invalid subgroup of Primates'
- 'Ceciliolemuroidea is an invalid subgroup of Primates'
- 'Chiromyoides belongs to Plesiadapidae'
- 'Chumashius belongs to Omomyinae'
- 'Dyseolemur belongs to Omomyinae'
- 'Elphidotarsius belongs to Carpolestidae'
- 'Europolemur belongs to Primates'
- 'Euryacodon belongs to Anaptomorphinae'
- 'Hemiacodon belongs to Omomyinae'
- 'Heterochiromys is a subjective synonym of Heterohyus'
- 'Heterohyus belongs to Apatemyidae'
- 'Hoanghonius belongs to Primates'
- 'Hoanghonius stehlini belongs to Hoanghonius'
- 'Ignacius is a subjective synonym of Phenacolemur'
- 'Jepsenella belongs to Apatemyidae'
- 'Labidolemur belongs to Apatemyidae'
- 'Loveina belongs to Omomyinae'
- 'Megachiromyoides belongs to Plesiadapidae'
- 'Megachiromyoides schluteri belongs to Megachiromyoides' according to Weigelt 1933
- 'Megatarsius belongs to Primates'
- 'Microchoeridae is a subjective synonym of Anaptomorphidae'
- 'Microchoerus belongs to Necrolemurinae'
- 'Microtarsioides belongs to Primates'
- 'Nannopithex belongs to Anaptomorphidae'
- 'Navajovius belongs to Omomyinae'
- 'Necrolemur belongs to Necrolemurinae'
- 'Necrolemurinae belongs to Anaptomorphidae'
- 'Necrosorex is a subjective synonym of Heterohyus'
- 'Notharctidae was reranked as the subfamily Notharctinae and belongs to Adapidae'
- 'Notharctus belongs to Notharctinae'
- 'Notharctus minutus is recombined as Omomys minutus'
- 'Omomyidae was reranked as the subfamily Omomyinae and belongs to Anaptomorphidae'
- 'Omomys belongs to Omomyinae'
- 'Omomys belgicus is recombined as Teilhardina belgica'
- 'Omomys vespertinus is recombined as Loveina vespertinus'
- 'Palaechthon belongs to Paromomyinae'
- 'Palenochtha belongs to Paromomyinae'
- 'Paromomyidae was reranked as the subfamily Paromomyinae and belongs to Anaptomorphidae'
- 'Paromomys belongs to Paromomyinae'
- 'Pelycodus belongs to Notharctinae'
- 'Periconodon belongs to Anaptomorphidae'
- 'Phenacolemur belongs to Primates'
- 'Platychoerops belongs to Plesiadapidae'
- 'Plesiadapidae belongs to Primates'
- 'Plesiadapis belongs to Plesiadapidae'
- 'Plesiolestes belongs to Paromomyinae'
- 'Pronothodectes belongs to Plesiadapidae'
- 'Pronycticebus belongs to Adapinae'
- 'Pronycticebus gaudryi belongs to Pronycticebus' according to G. Grandidier 1904
- 'Pronycticebus gaudryi belongs to Pronycticebus'
- 'Protoadapis belongs to Notharctinae'
- 'Pseudoloris belongs to Pseudolorisinae'
- 'Pseudolorisinae belongs to Anaptomorphidae'
- 'Shoshonius belongs to Omomyinae'
- 'Sinclairella belongs to Apatemyidae'
- 'Stehlinella belongs to Apatemyidae'
- 'Teilhardella belongs to Apatemyidae'
- 'Teilhardina belongs to Omomyinae'
- 'Tetoniidae is an invalid subgroup of Anaptomorphidae'
- 'Tetonius belongs to Anaptomorphinae'
- 'Trogolemur belongs to Primates'
- 'Uintanius belongs to Anaptomorphinae'
- 'Uintasorex belongs to Primates'
- 'Washakius belongs to Omomyinae'