Mammalia - Rodentia - Castoridae
Parent taxon: Castoridae according to N. Rybczynski 2007
See also Korth 2014
Sister taxa: Agnotocastor, Agnotocastorinae, Anchitheriomyinae, Anchitheriomys, Asiacastor, Boreofiber, Capatanka, Castorinae, Castoroidinae, Chalicomys, Euroxenomys, Migmacastor, Neatocastor, Oligotheriomys, Palaeomys, Romanocastor, Trigontherium, Trogontheriinae, Trogontherium, Youngofiber, Zamolxifiber
Subtaxa: Capacikala Euhapsis Fossorcastor Palaeocastor Pseudopalaeocastor
Ecology: amphibious browser
Distribution:
• Miocene of United States (1: Texas collection)
• Harrisonian of United States (13: Nebraska, South Dakota, Wyoming)
• Arikareean of United States (24: Montana, Nebraska, Nevada, Oregon, South Dakota, Wyoming)
• Oligocene of Kazakhstan (5), United States (65: Nebraska, Oregon, South Dakota)
Total: 108 collections including 123 occurrences