Class Mammalia Linnaeus, 1758 - mammals
Order Rodentia Bowdich, 1821 - rodents
Suborder Sciurognathi (Tullberg, 1899)
see Suborder Sciuromorpha Brandt, 1855
Family Muridae Batsch, 1788 - rats, mice, hamsters, voles, lemmings, and gerbils
Subfamily Sigmodontinae Wagner, 1843
Genus Onychomys Baird, 1857 - grasshopper mice
1 Onychomys arenicola Mearns, 1896 - Mearns' grasshopper mouse
2 Onychomys leucogaster (Wied-Neuwied, 1841) - northern grasshopper mouse
3 Onychomys torridus (Coues, 1874) - southern grasshopper mouse