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
         1 Superfamily †Peradectoidea Marshall et al., 1990 see Order Peradectia Marshall, Case & Woodburne, 1990
         2.1 Genus †Szalinia de Muizon & Cifelli, 2001
         2.2.1.1 Genus †Tiulordia Marshall & de Muizon, 1988
         2.2.1.2 Genus †Gaylordia Paula Couto, 1952
         2.2.2.1.1 Genus †Marmosopsis Paula Couto, 1962
         2.2.2.1.2 Genus †Incadelphys Marshall & de Muizon, 1988
         2.2.2.2 Family †Jaskhadelphyidae de Muizon, 1992