Mammalia - Rodentia - Ischyromyidae
Parent taxon: Ischyromyidae according to G. G. Simpson 1945
See also Dawson 2001, Dunn and Rasmussen 2007, Sahni and Khare 1973, Sahni and Srivastava 1976, Wilson 1949 and Wilson 1949
Sister taxa: Acritoparamys, Ailuravinae, Apatosciuravus, Churcheria, Decticadapis, Hulgana, Ischyromyinae, Ischyromys, Lophiparamys, Microparamyinae, Notoparamys, Pseudoparamyinae, Rapamys, Tapomys, Thisbemys, Uintaparamys
Subtaxa: Abrosomys Manitshini Metaparamys Paramyini Paramys
Ecology: ground dwelling herbivore
Distribution:
• Oligocene of United States (1: South Dakota collection)
• Eocene of Belgium (1), Canada (3: Northwest Territories, Saskatchewan), China (1), France (9), Germany (1), Kazakhstan (1), Spain (1), Switzerland (1), the United Kingdom (5), United States (322: California, Colorado, Mississippi, New Mexico, North Dakota, Oregon, Texas, Utah, Wyoming)
• Paleocene of United States (8: Colorado, Wyoming)
Total: 354 collections including 436 occurrences