Eomyidae List of the Cenozoic life of Nebraska List of the Cenozoic life of Montana List of the Cenozoic life of Wyoming Procastoroides Monosaulax Dipoides Steneofiber Trogontherium Migmacastor Youngofiber Eucastor Diprionomys Rhizospalax Palaeocastor Agnotocastor Eomys Metaliomys Anchitheriomys Castoroides Apeomyoides Aurimys Heteromys Perognathus Kangaroo mouse Heterogeomys Chaetodipus Smooth-toothed pocket gopher Buller's pocket gopher Cratogeomys Geomys Kangaroo rat Beaver Michoacan pocket gopher Giant pocket gopher