Phylum Chordata Bateson, 1885 - chordates Subphylum Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801 Superclass Homotherma Class Mammalia Linnaeus, 1758 - mammals 1 Subclass Prototheria Gill, 1872 - monotremes 2 Subclass Theria Parker & Haswell, 1897