Mammalia - Rodentia - Ischyromyidae
Parent taxon: Ischyromyidae according to M. R. Dawson 2001
Sister taxa: Acritoparamys, Ailuravinae, Apatosciuravus, Churcheria, Decticadapis, Hulgana, Ischyromyinae, Ischyromys, Leptotomus, Lophiparamys, Notoparamys, Paramyinae, Paramys, Pseudoparamyinae, Rapamys, Tapomys, Thisbemys
Subtaxa: Hartenbergeromys Masillamys Mattimys Microparamys Pantrogna Sparnacomys Strathcona
Ecology: ground dwelling herbivore
Distribution:
• Eocene of Belgium (1 collection), Canada (3: Northwest Territories, Saskatchewan), China (1), France (9), Portugal (1), Spain (3), the United Kingdom (5), United States (124: California, Colorado, Montana, Nevada, New Mexico, Texas, Utah, Wyoming)
• Clarkforkian of United States (1: Wyoming)
• Paleocene to Eocene of United States (1: Wyoming)
Total: 149 collections including 165 occurrences