Attributes / relations provided by
♦ 1Geomys breviceps, James M. Sulentich, Lawrence R. Williams, and Guy N. Cameron, MAMMALIAN SPECIES No. 383, pp. 1-4 (1991)
♦ 2Microtus californicus (Rodentia: Cricetidae), NICHOLE L. CUDWORTH AND JOHN L. KOPROWSKI, MAMMALIAN SPECIES 42(868):230–243 (2010)
♦ 3Spermophilus franklinii, Andrea C. Ostroff and Elmer J. Finck, MAMMALIAN SPECIES No. 724, pp. 15 (2003)
♦ 4Spermophilus richardsonii, Gail R. Michener and James W. Koeppl, Mammalian Species No. 243, pp. 1-8, (1985)