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 †Meridiungulata McKenna, 1975 - South American ungulates see Grandorder Meridiungulata McKenna, 1975
                             Order †Notoungulata Roth, 1903
                               Suborder †Toxodontia Owen, 1853
                                 Family †Toxodontidae Owen, 1845
                                   Subfamily †Haplodontheriinae Ameghino, 1907
                                     01 Genus †Paratrigodon Cabrera & Kraglievich, 1931
                                     02 Genus †Prototrigodon Kraglievich, 1930
                                     03 Genus †Pachynodon Burmeister, 1891
                                     04 Genus †Haplodontherium Ameghino, 1885
                                     05 Genus †Abothrodon Couto, 1944
                                     06 Genus †Toxodontherium Ameghino, 1883
                                     07 Genus †Mesotoxodon Paula Couto, 1982
                                     08 Genus †Ocnerotherium Pascual, 1954
                                     09 Genus †Trigodon Ameghino, 1887
                                     10 Genus †Trigodonops Kraglievich, 1930
                                     11 Genus †Mixotoxodon van Frank, 1957