Kingdom Animalia Linnaeus, 1758 - animals Phylum Craniata Linnaeus, 1758 see Subphylum Vertebrata Cuvier, 1812 Class Mammalia Linnaeus, 1758 - mammals Subclass Prototheria Gill, 1872 [monotypic] - monotremes Order Monotremata Bonaparte, 1837 - monotremes 1 Family Tachyglossidae Gill, 1872 - spiny anteaters 2 Family Ornithorhynchidae Gray, 1825 - platypuses