Phylum [Vertebrata] Lamarck, 1801 see Infraphylum Vertebrata Lamarck, 1801
   Class Mammalia Linnaeus, 1758 - mammals
     Subclass Theria Parker & Haswell, 1897
       Infraclass Metatheria Huxley, 1880
         Order Marsupialia Jameson, 1818 - marsupials see Cohort Marsupialia Jameson, 1818
           Suborder Didelphoidea Gray, 1821 see Superfamily Didelphoidea Gray, 1821
             Family †Argyrolagidae Ameghino, 1904
               1 Genus †Argyrolagus Ameghino, 1904