Class Mammalia Linnaeus, 1758 - mammals
   Subclass Boreosphenida Luo, Cifelli & Kielan-Jaworowska, 2001 - tribotherians see Clade Boreosphenida Luo, Cifelli & Kielan-Jaworowska 2001
     Infraclass Metatheria Huxley, 1880
       Cohort Marsupialia Jameson, 1818 - marsupials
         Superorder "Ameridelphia" Szalay, 1982 [paraphyletic] see Clade Ameridelphia Szalay 1982
           1 Genus †Anchistodelphys Cifelli, 1990, incertae sedis
           2 Genus †Iugomortiferum Cifelli, 1990, incertae sedis [monotypic]
           3 Genus †Kokopellia Cifelli, 1993, incertae sedis [monotypic]
           4 Order †Asiadelphia Trofimov & Szalay, 1993 [monotypic]
           5 Order "Didelphimorphia" Gill, 1872 [paraphyletic]
           5.n Order Paucituberculata Ameghino, 1894