Phylum [Vertebrata] Lamarck, 1801 see Infraphylum 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