Phylum [Vertebrata] Lamarck, 1801 see Infraphylum Vertebrata Lamarck, 1801 Class Mammalia Linnaeus, 1758 - mammals Subclass Prototheria Gill, 1872 - monotremes Order †Triconodonta Osborn, 1888 Family †Morganucodontidae Kühne, 1958 1 Genus †Megazostrodon Crompton & Jenkins, 1968