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] †Sparassodonta Ameghino, 1894
         Family †Hondadelphyidae Marshall, Case & Woodburne, 1990 [monotypic]
           1 Genus †Hondadelphys Marshall, 1976