Kingdom [Animalia] Linnaeus, 1758 - animals
   Phylum Chordata Bateson, 1885 - chordates
     Subphylum Vertebrata Cuvier, 1812 - vertebrates
       Class Mammalia Linnaeus, 1758 - mammals
         Subclass Theria Parker & Haswell, 1897
           Infraclass Eutheria Gill, 1872
             Order Perissodactyla Owen, 1848 - odd-toed ungulates
               1 Suborder Hippomorpha Wood, 1937
               2 Suborder †Ancylopoda Cope, 1889 see Superfamily Chalicotherioidea Gill, 1872
               3 Suborder Ceratomorpha Wood, 1937