Kingdom [Animalia] Linnaeus, 1758 - animals
   Phylum Chordata Bateson, 1885 - chordates
     Subphylum Vertebrata Cuvier, 1812 - vertebrates
       Class Mammalia Linnaeus, 1758 - mammals
         Subclass Theria Parker & Haswell, 1897
           1 Infraclass †Patriotheria
           2 Infraclass Metatheria Huxley, 1880
           3 Infraclass Eutheria Gill, 1872