Mammalia - Rodentia - Heliscomyidae
Full reference: W. W. Korth, J. H. Wahlert, and R. J. Emry. 1991. A New Species of Heliscomys and Recognition of the Family Heliscomyidae (Geomyoidea: Rodentia). Journal of Vertebrate Paleontology 11(2):247-256
Parent taxon: Geomyoidea according to W. W. Korth et al. 1991
See also Kelly 2009, Korth et al. 2022 and Korth and Branciforte 2007
Sister taxa: Eomyidae, Farangimys, Geomyidae, Griphomys, Heteromyidae, Hydentomys
Subtaxa: Apletotomeus Heliscomys Megaheliscomys Passaliscomys Tylionomys
Ecology: ground dwelling herbivore
Distribution:
• Miocene of Canada (1: Saskatchewan collection)
• Harrisonian of United States (2: Nebraska)
• Arikareean of United States (5: California, Florida, South Dakota)
• Oligocene of Canada (1: Saskatchewan), United States (22: Colorado, Florida, Montana, Nebraska, South Dakota, Wyoming)
• Eocene to Oligocene of United States (1: Nebraska)
• Eocene of Canada (4: Saskatchewan), United States (13: California, Montana, Nebraska, North Dakota, Utah, Wyoming)
Total: 49 collections including 61 occurrences