Kingdom [Animalia] Linnaeus, 1758 - animals
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   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
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     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
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       Subdivision Bilateralia
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         Phylum Chordata Bateson, 1885 - chordates
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           Subphylum Vertebrata Cuvier, 1812 - vertebrates
          Count: -
             Class Mammalia Linnaeus, 1758 - mammals
            Count: -
               Subclass Eutheria Gill, 1872 see Infraclass Eutheria Gill, 1872
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                 Superorder Mesaxonia (Marsh, 1884)
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                   Order Perissodactyla Owen, 1848 - odd-toed ungulates
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                     Suborder Hippomorpha Wood, 1937
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                       Superfamily Equoidea (Gray, 1821) Hay, 1902 see Family Equidae Gray, 1821
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                         Family Equidae Gray, 1821 - horses, zebras, and asses
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                           Genus Equus Linnaeus, 1758 - horses, zebras, and asses
                          Count: [*†*] 6s;16ss; ‡7ss; †4s;1ss
                             Subgenus Equus Linnaeus, 1758 see Equus caballus group Linnaeus, 1758
                            Count: [*†*] 1s;2ss; ‡3ss; †2s;1ss
                               1 †Equus (Equus) bressanus
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                               2 †Equus (Equus) mosbachensis
                              Count: -
                               3 Equus (Equus) przewalskii Poliakov, 1881 see Equus caballus przewalskii Poliakov, 1881
                              Count: [*†*] 2ss; ‡3ss; †1ss