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
       Notometatheria Kirsch, Lapointe & Springer 1997
         Marsupialia Jameson 1818 [O'Leary, Allard, Novacek, Meng & Gatesy 2004] see Cohort Marsupialia Jameson, 1818
           [Order] Didelphimorphia Gill, 1872
             Superfamily Didelphoidea Gray, 1821
               Family †Sparassocynidae Reig, 1958
                 1 Genus †Thylatheridium Reig, 1952
                 2.1 Genus †Sparassocynus Mercerat, 1898
                 2.2 Genus †Hesperocynus Forasiepi, Goin & Martinelli, 2009