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 Artiodactyla Owen, 1848 - even-toed ungulates see Order Cetartiodactyla Montgelard, Catzeflis & Douzery, 1997
               Suborder Suina Gray, 1868
                 1 Family †Dichobunidae Turner, 1849
                 2 Family †Entolodontidae see Family Entelodontidae Lydekker, 1883
                 3 Family Suidae Gray, 1821 - pigs
                 4 Family Tayassuidae Palmer, 1897 (1849) - peccaries
                 5 Family †Anthracotheriidae Leidy, 1869
                 6 Family Hippopotamidae Gray, 1821 - hippopotamuses