Class Mammalia Linnaeus, 1758 - mammals
Subclass Theria Parker & Haswell, 1897
Infraclass Eutheria Gill, 1872
Magnorder Boreoeutheria Springer & de Jong, 2001
Superorder Laurasiatheria Waddell, Okada & Hasegawa, 1999
Order Perissodactyla Owen, 1848 - odd-toed ungulates
Suborder Hippomorpha Wood, 1937 [monotypic]
Family Equidae Gray, 1821 - horses, zebras, and asses