Phylum Chordata Bateson, 1885 - chordates Count: - Subphylum Vertebrata Cuvier, 1812 - vertebrates Count: - Superclass Homotherma Count: - Class Mammalia Linnaeus, 1758 - mammals Count: - 1 Subclass Prototheria Gill, 1872 - monotremes Count: [o] 1o 2 Subclass Theria Parker & Haswell, 1897 Count: -