Mammaliaformes Rowe 1988
   [crown] Class Mammalia Linnaeus, 1758 - mammals
     Subclass Theriiformes Rowe, 1988 see Division Theriiformes Rowe, 1988
       Infraclass Holotheria Wible, Rougier, Novacek, McKenna & Dashzeveg, 1995 see Clade Holotheria Wible, Rougier, Novacek, McKenna & Dashzeveg 1995
         Superlegion Trechnotheria McKenna, 1975 see Clade Trechnotheria McKenna 1975
           Legion Cladotheria McKenna, 1975 see Clade Cladotheria McKenna 1975
             Sublegion Zatheria McKenna, 1975 see Clade Zatheria McKenna 1975
               Infralegion Tribosphenida McKenna, 1975 see Subclass Boreosphenida Luo, Cifelli & Kielan-Jaworowska, 2001
                 [crown] Supercohort Theria Parker & Haswell, 1897 - therians see Subclass Theria Parker & Haswell, 1897
                   Cohort Placentalia Owen, 1837 - placentals
                     Magnorder Epitheria McKenna, 1975 see Cohort Placentalia Owen, 1837
                       Superorder Preptotheria McKenna, 1975
                         Grandorder Ungulata Linnaeus, 1766
                           Mirorder Altungulata Prothero & Schoch, 1989
                             Order Uranotheria McKenna & Bell, 1997 see Grandorder Paenungulata Simpson, 1945
                               Suborder Tethytheria McKenna, 1975 see Mirorder Tethytheria McKenna, 1975
                                 Infraorder Behemota McKenna, Bell & Shoshani, 1997 see Clade Behemota McKenna, Bell & Shoshani 1997
                                   Parvorder Proboscidea Owen, 1859 see Order Proboscidea Owen, 1859
                                     Superfamily Elephantoidea Gray, 1821
                                       Subfamily †Choerolophodontinae Gaziry, 1976
                                         1 Genus †Choerolophodon Schlesinger, 1917 - pig-toothed mastodons