†subfamily Microsyopinae Osborn and Wortman 1892 (primate)
Mammalia - Primates - Microsyopidae
Parent taxon: Microsyopidae according to G. F. Gunnell 1989
Sister taxa: Nanomomys, Navajoviinae, Navajovius, Uintasoricinae
Subtaxa: Arctodontomys Craseops Megadelphus Microsyops
Ecology: arboreal omnivore
Distribution:
• Eocene of United States (284: California, Colorado, New Mexico, North Dakota, Texas, Utah, Wyoming collections)
• Paleocene of United States (12: Colorado, Wyoming)
Total: 296 collections including 313 occurrences