Class [Mammalia] Linnaeus, 1758 - mammals
Order Rodentia Bowdich, 1821 - rodents
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 interpres (Merriam, 1890) - Texas antelope-squirrel
3 Ammospermophilus leucurus (Merriam, 1889) - white-tailed antelope-squirrel
4 Ammospermophilus nelsoni (Merriam, 1893) - Nelson's antelope-squirrel