Phylum [Vertebrata] (Lamarck, 1801) Class Mammalia Linnaeus, 1758 - mammals Subclass Prototheria Gill, 1872 - monotremes 1 Order †Triconodonta Osborn, 1888 2 Order †Multituberculata Cope, 1884 3 Order Monotremata Bonaparte, 1837 - monotremes