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 quagga group Boddaert, 1785
             1 Equus burchellii (Gray, 1824) - Burchell's zebra
             2 ‡Equus quagga Boddaert, 1785 - quagga