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
             Family †Glasbiidae Clemens, 1966 [monotypic]
               Genus †Glasbiusᵀ Clemens, 1966
                 †Glasbius twitchelli Archibald, 1982