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 Order Paucituberculata Ameghino, 1894 1 Family †Glasbiidae Clemens, 1966 [monotypic]