Mammalia Linnaeus 1758 [Rowe 2020] see Class Mammalia Linnaeus, 1758
   Theria Parker & Haswell 1897 [McKenna 1975] see Subclass Theria Parker & Haswell, 1897
     Metatheria Huxley 1880 [O'Leary, Allard, Novacek, Meng & Gatesy 2004] see Infraclass Metatheria Huxley, 1880
       Marsupialiformes Vullo, Gheerbrant, de Muizon & Néraudeau, 2009
         †Ameridelphia Szalay 1982
           Sudameridelphia Szalay 1994
             Notometatheria Kirsch, Lapointe & Springer 1997
               [Family] †Derorhynchidae Marshall, 1987
                 1 Genus †Diogenesia Oliveira, Carneiro & Goin, 2021 [monotypic]
                 2.1 Genus †Derorhynchus Paula Couto, 1952
                 2.2.1 Genus †Coona Simpson, 1938
                 2.2.2 Genus †Pauladelphys Goin, Case, Woodburne, Vizcaino & Reguero, 1999