Latitudinal range: 19.4° to 44.1°

Found in 12 samples

Mexico: El Zurdo (Holocene), Cerro Portezuelo (Holocene)

United States: Papago Springs Cave (Late Pleistocene), Haystack Cave (upper levels) (Pleistocene - Holocene), Bone Cave (Holocene), Rattlesnake Point Pueblo (Unit 2) (Holocene), Camels Back Cave (Stratum I) (Holocene), Kathy's Pit (Pleistocene - Holocene), Mescal Cave (Pleistocene - Holocene), Sunshine Locality (Unit D) (Holocene), Sunshine Locality (Unit E) (Late Pleistocene), Smith Creek Canyon (Reddish-brown Silt) (Late Pleistocene)

See also Thomomys, Thomomys bottae, Thomomys orientalis, Thomomys potamacensis, Thomomys spp., Thomomys talpoides, Thomomys umbrinus