Mammalia Linnaeus 1758 [Rowe 2020]
   Theria Parker & Haswell 1897 [McKenna 1975] see Subclass Theria Parker & Haswell, 1897
     Metatheria Huxley 1880 [O'Leary, Allard, Novacek, Meng & Gatesy 2004] see Infraclass Metatheria Huxley, 1880
       Marsupialiformes Vullo, Gheerbrant, de Muizon & Néraudeau, 2009
         †Ameridelphia Szalay 1982
           Sudameridelphia Szalay 1994
             Notometatheria Kirsch, Lapointe & Springer 1997
               Marsupialia Jameson 1818 [O'Leary, Allard, Novacek, Meng & Gatesy 2004] see Cohort Marsupialia Jameson, 1818
                 1 Genus †Djarthia Godthelp, Wroe & Archer, 1999
                 2.1 Didelphimorphia Gill, 1872
                 2.2.1 Paucituberculata Ameghino, 1894
                 2.2.2 Australidelphia Szalay 1982 see Magnorder Australidelphia Szalay, 1982