Mammalia Linnaeus 1758 [Rowe 1988], nom. cl. inval. see Class Mammalia Linnaeus, 1758
   Metatheria Huxley 1880 [O'Leary, Allard, Novacek, Meng & Gatesy 2004] see Infraclass Metatheria Huxley, 1880
     Marsupialiformes Vullo, Gheerbrant, de Muizon & Néraudeau, 2009
       Order †Archimetatheria Szalay, 1994
         1.1 Genus †Pariadens Cifelli & Eaton, 1987
         1.2 Family †Stagodontidae Marsh, 1889
         2.1.1 Genus †Iugomortiferum Cifelli, 1990
         2.1.2 Genus †Dakotadens Eaton, 1993
         2.2 Superfamily †Pediomyoidea Simpson, 1927