Class Mammalia Linnaeus, 1758 - mammals
   Subclass Australosphenida Luo, Cifelli & Kielan-Jaworowska, 2001 see Clade Australosphenida Luo, Cifelli & Kielan-Jaworowska 2001
     1 Order †Ausktribosphenida Rich,Vickers-Rich, Constantine, Flannery, Kool & van Klaveren, 1997
     2 Order Monotremata Bonaparte, 1837 - monotremes