[Kingdom] Animalia Linnaeus, 1758 - animals
   Grade Enterozoa
     Grade Cœlomata
       Phylum Vertebrata (Lamarck, 1801)
         Branch Craniata Linnaeus, 1758
           Grade Gnathostoma
             Subgrade Pentadactyla lipobranchia
               Branch Amphicondyla [monotypic]
                 Class Mammalia Linnaeus, 1758 - mammals
                   Grade Marsupialia Jameson, 1818
                     Order Rhizophaga
                       Genus Phascolomys Dumeril, 1806 see Genus Vombatus Geoffroy Saint-Hilaire, 1803