Order Rodentia - Family Geomyidae Author Wilson, Don E. Author Reeder, DeeAnn text 2005 The Johns Hopkins University Press Baltimore Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 2 859 870 book chapter 0-8018-8221-4 10.5281/zenodo.7316535 Thomomys (Megascapheus) townsendii (Bachman 1839) Thomomys (Megascapheus) townsendii (Bachman 1839) , J. Acad. Nat. Sci. Philadelphia, 8: 105 . Type Locality: USA , erroneously given as "Columbia River", but restricted to Idaho , Canyon Co., near Nampa, by Bailey (1915). Vernacular Names: Townsend's Pocket Gopher . Subspecies: : Subspecies Thomomys (Megascapheus) townsendii subsp. townsendii (Bachman 1839) Subspecies Thomomys (Megascapheus) townsendii subsp. nevadensis ( Merriam 1897 ) Distribution: Snake River Valley of Idaho south and west to SE Oregon , NE California , and N Nevada ( USA ). Conservation: IUCN – Lower Risk (lc). Discussion: Subgenus Megascapheus . Revised by Davis (1937) and Rogers (1991 a , b ), who recognized only two valid subspecies ( townsendii and nevadensis ). Considered a distinct species by Thaeler (1968 b ) , Patton et al. (1984) , Patton and Smith (1989 , 1994), and Rogers (1991 a , b ), despite limited hybridization with bottae in NE California . Hall (1981:469 , 495) reviewed Thaeler's evidence and included townsendii in umbrinus ( sensu Hall) .