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
             01 Order †Arctocyonia Van Valen, 1969
             02 Order †Taeniodonta Cope, 1876
             03 Order †Pantodonta Cope, 1873
             04 Order †Tillodontia Marsh, 1875
             05 Order †Dinocerata Marsh, 1873
             06 Order †Embrithopoda Andrews, 1906
             07 Order Artiodactyla Owen, 1848 - even-toed ungulates see Order Cetartiodactyla Montgelard, Catzeflis & Douzery, 1997
             08 Order †Acreodi Matthew, 1909 see Order Mesonychia Matthew, 1937
             09 Order Cetacea Brisson, 1762 - whales, dolphins, and porpoises see Infraorder Cetacea Brisson, 1762
             10 Order Perissodactyla Owen, 1848 - odd-toed ungulates
             11 Order Hyracoidea Huxley, 1869 - hyraxes