Phylum Chordata Bateson, 1885 - chordates Subphylum Vertebrata Cuvier, 1812 - vertebrates Superclass Homotherma Class Mammalia Linnaeus, 1758 - mammals Subclass Theria Parker & Haswell, 1897 1 Infraclass Metatheria Huxley, 1880 2 Infraclass Eutheria Gill, 1872