Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Class Mammalia Linnaeus, 1758 - mammals
               1 Subclass Prototheria Gill, 1872 - monotremes
               2 Subclass Metatheria Huxley, 1880 see Infraclass Metatheria Huxley, 1880
               3 Subclass Eutheria Gill, 1872 see Infraclass Eutheria Gill, 1872