Mammalia Linnaeus 1758 [Rowe 2020] see Class Mammalia Linnaeus, 1758
   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
             †Pucadelphyda de Muizon, Ladevèze, Selva, Vignaud & Goussard, 2018
               1 †Pucadelphyidae de Muizon, 1998
               2.1 †Polydolopimorphia Archer, 1984
               2.2 †Sparassodonta Ameghino, 1894