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
         [Superfamily †Pediomyiodea Carneiro, Oliveira & Goin, 2018, orth. inval.] see Superfamily Pediomyoidea Simpson, 1927