Kingdom [Animalia] Linnaeus, 1758 - animals Phylum Chordata Bateson, 1885 - chordates Subphylum Vertebrata Cuvier, 1812 - vertebrates Class Mammalia Linnaeus, 1758 - mammals Subclass Prototheria Gill, 1872 - monotremes Infraclass Allotheria (Marsh, 1880) Order Monotremata Bonaparte, 1837 - monotremes