Class Mammalia Linnaeus, 1758 - mammals
   Order Rodentia Bowdich, 1821 - rodents
     Suborder Sciurognathi (Tullberg, 1899) see Suborder Sciuromorpha Brandt, 1855
       Family Sciuridae Batsch, 1788 - squirrels, chipmunks, marmots, and prairie dogs
         Subfamily Sciurinae Batsch, 1788 - tree and ground squirrels
           Genus Ammospermophilus Merriam, 1892 - antelope-squirrels
             1 Ammospermophilus harrisii (Audubon & Bachman, 1854) - Harris' antelope-squirrel
             2 Ammospermophilus insularis Nelson & Goldman, 1909
             3 Ammospermophilus interpres (Merriam, 1890) - Texas antelope-squirrel
             4 Ammospermophilus leucurus (Merriam, 1889) - white-tailed antelope-squirrel
             5 Ammospermophilus nelsoni (Merriam, 1893) - Nelson's antelope-squirrel