Mammalia - Theriamorpha - Oligoryctidae
Full reference: R. J. Asher, M. C. McKenna, R. J. Emry, A. R. Tabrum, and D. G. Kron. 2002. Morphology and relationships of Apternodus and other extinct, zalambdodont, placental mammals. Bulletin of the American Museum of Natural History 273:1-117
Parent taxon: Soricoidea according to G. F. Gunnell et al. 2008
See also Asher et al. 2002 and Korth et al. 2022
Sister taxa: Apternodontidae, Micropternodontidae, Nyctitheriidae, Parapternodontidae
Subtaxa: Oligoryctes
Ecology: scansorial insectivore
Distribution:
• Oligocene of United States (3: Colorado, Montana, North Dakota collections)
• Eocene to Oligocene of United States (1: Nebraska)
• Eocene of Canada (3: Saskatchewan), United States (25: California, Montana, Nebraska, North Dakota, South Dakota, Wyoming)
Total: 32 collections including 36 occurrences