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
       Notometatheria Kirsch, Lapointe & Springer 1997
         Marsupialia Jameson 1818 [O'Leary, Allard, Novacek, Meng & Gatesy 2004] see Cohort Marsupialia Jameson, 1818
           [Order] Paucituberculata Ameghino, 1894
             1 Genus †Bardalestes Goin, Candela, Abello & Oliveira, 2009
             2.1.1 Genus †Riolestes Goin, Candela, Abello & Oliveira, 2009
             2.1.2 Genus †Fieratherium Forasiepi, Goin, Abello & Cerdeño, 2014
             2.2.1 Genus †Evolestes Goin, Sánchez-Villagra, Abello & Kay, 2007
             2.2.2.1 Genus †Pichipilus Ameghino, 1890
             2.2.2.2.1 Genus †Stilotherium Ameghino, 1887
             2.2.2.2.2 Genus Caenolestes Thomas, 1895 - common "shrew" opossums