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] †Peradectia Marshall, Case & Woodburne, 1990
         Superfamily †Peradectoidea Marshall et al., 1990 see Order Peradectia Marshall, Case & Woodburne, 1990
           1.1 Family †Mayulestidae de Muizon, 1994 [monotypic]
           1.2 Family †Pucadelphyidae de Muizon, 1998
           2 Family †Peradectidae Crochet, 1979