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
               †Sternbergiidae Szalay, 1994
                 1 Genus †Carolopaulacoutoia McKenna & Bell, 1997
                 2.1 Genus †Amphiperatherium Filhol, 1879
                 2.2.1 Genus †Peratherium Aymard, 1850
                 2.2.2.1 Genus †Itaboraidelphys Marshall & de Muizon, 1984
                 2.2.2.2 Genus †Didelphopsis Paula Couto, 1952