Class Mammalia Linnaeus, 1758 - mammals
   Clade Yinotheria Chow & Rich 1982 [Kielan-Jaworowska, Cifelli & Luo 2004]
     Subclass Australosphenida Luo, Cifelli & Kielan-Jaworowska, 2001 see Clade Australosphenida Luo, Cifelli & Kielan-Jaworowska 2001
       Order †Ausktribosphenida Rich,Vickers-Rich, Constantine, Flannery, Kool & van Klaveren, 1997 [monotypic]
         Family †Ausktribosphenidae Rich, Vickers-Rich, Constantine, Flannery, Kool & van Klaveren, 1997
           Genus †Ausktribosphenos Rich, Vickers-Rich, Constantine, Flannery, Kool & van Klaveren, 1997 [monotypic]
             1 †Ausktribosphenos nyktos Rich, Vickers-Rich, Constantine, Flannery, Kool & van Klaveren, 1997