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 Perissodactyla Owen, 1848 - odd-toed ungulates
                               Suborder Ceratomorpha Wood, 1937
                                 Infraorder †Selenida McKenna & Bell, 1997
                                   Superfamily †Brontotherioidea Marsh, 1873
                                     Family †Brontotheriidae Marsh, 1873
                                       01 Genus †Pakotitanops West, 1980
                                       02 Genus †Nanotitan Qi & Beard, 1996
                                       03 Subfamily †Lambdotheriinae Cope, 1889
                                       04 Subfamily †Palaeosyopinae Steinmann & Döderlein, 1890
                                       05 Subfamily †Dolichorhininae Riggs, 1912
                                       06 Subfamily †Brontotheriinae Marsh, 1873
                                       07 Subfamily †Embolotheriinae Osborn, 1929
                                       08 Subfamily †Brontopinae Osborn, 1914
                                       09 Subfamily †Telmatheriinae Osborn, 1914
                                       10 Subfamily †Menodontinae Cope, 1881