rutilus Genus Spermophilopsis Long-clawed ground squirrel, Spermophilopsis leptodactylus Fossil species Genus Heteroxerus †Heteroxerus grivensis Genus Aragoxerus †Aragoxerus ignis References Thorington, R.W., Jr. and Hoffmann, R.S. 2005. Family Sciuridae. Pp. 754–818 in Wilson, D.E. and Reeder, D.M. (eds.). Mammal Species of the World: a taxonomic and geographic reference. 3rd ed. Baltimore: The Johns Hopkins University Press, 2 vols., 2142 pp. Xerini Mammals of Africa Mammal tribes