Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
   Gnathostomata
     Teleostomi Bonaparte, 1836
       Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988], nom. cl. inval. see Clade Tetrapoda Hatschek & Cori 1896 [Laurin 2020]
         Amniota Haeckel, 1866 [Gauthier, Kluge & Rowe 1988], nom. cl. inval. - amniotes see Clade Amniota Haeckel 1866 [Laurin & Reisz 2020]
           Class Mammalia Linnaeus, 1758 - mammals
             Subclass Theria Parker & Haswell, 1897
               Theria of Metatherian-Eutherian grade
                 Infraclass Eutheria Gill, 1872
                   Order Proboscidea Owen, 1859 - elephants
                     1 ?Suborder †Moeritherioidea see Family Moeritheriidae Andrews, 1906
                     2 Suborder Euelephantoidea see Suborder Elephantiformes (Tassy, 1988)
                     3 Suborder †Mammutoidea see Superfamily Mammutoidea Hay, 1922
                     4 Suborder †Deinotherioidea Osborn, 1936 [monotypic] see Family Deinotheriidae Bonaparte, 1841
                     5 Suborder †Barytherioidea Simpson, 1945 [monotypic] see Family Barytheriidae Andrews, 1906