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
           Family †Peradectidae Crochet, 1979
             1.1 Genus †Golerdelphys Williamson & Lofgren, 2014
             1.2 Genus †Mimoperadectes Bown & Rose, 1979
             2.1 Genus †Thylacodon Matthew & Granger, 1921
             2.2.1 Genus †Peradectes Matthew & Granger, 1921
             2.2.2.1 Genus †Nanodelphys McGrew, 1937
             2.2.2.2 Genus †Didelphidectes Hough, 1961
             2.2.2.3 Genus †Siamoperadectes Ducrocq, Buffetaut, Buffetaut-Tong, Jaeger, Jongkanjanasoontorn & Suteethorn, 1992