Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Class Mammalia Linnaeus, 1758 - mammals
               Subclass Eutheria Gill, 1872 see Infraclass Eutheria Gill, 1872
                 Superorder Paenungulata Simpson, 1945 see Grandorder Paenungulata Simpson, 1945
                   Order Proboscidea Owen, 1859 - elephants
                     Superfamily †Moeritherioidea
                       Family †Mastodontidae Gray, 1821
                         Genus †Stegomastodon Pohlig, 1912
                           1 †Stegomastodon arizonae Gidley, 1926