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
                 Genus †Diogenesia Oliveira, Carneiro & Goin, 2021 [monotypic]
                   1 †Diogenesia brevirostris Oliveira, Carneiro & Goin, 2021