Phylum [Vertebrata] Lamarck, 1801 see Infraphylum Vertebrata Lamarck, 1801
   Class Mammalia Linnaeus, 1758 - mammals
     Subclass Theria Parker & Haswell, 1897
       Infraclass Eutheria Gill, 1872
         Cohort Epitheria McKenna, 1975
           Superorder Ungulata Linnaeus, 1766
             Order Perissodactyla Owen, 1848 - odd-toed ungulates
               Suborder Ceratomorpha Wood, 1937
                 Family †Hyracodontidae Cope, 1879
                   1 Genus †Hyracodon Leidy, 1856
                   2 Genus †Indricotherium Borissiak, 1915