Class Mammalia Linnaeus, 1758 - mammals
   Subclass Acrotheria Averianov & Lopatin, 2011
     Infraclass †"Triconodonta" Osborn, 1888 [paraphyletic] see Order Triconodonta Osborn, 1888
       Order †Amphidontoidea Prothero, 1981 [monotypic]
         1 Family †Amphidontidae Simpson, 1925