Class Mammalia Linnaeus, 1758 - mammals
Subclass Theria Parker & Haswell, 1897
Order Perissodactyla Owen, 1848 - odd-toed ungulates
Family Equidae Gray, 1821 [monotypic] - horses, zebras, and asses
Genus Equus Linnaeus, 1758 - horses, zebras, and asses
Equus asinus group Linnaeus, 1758 [monotypic]
Equus asinus Linnaeus, 1758 - ass
Equus asinus africanus Heuglin & Fitzinger, 1866 - wild ass