Class Mammalia Linnaeus, 1758 - mammals
   Subclass Acrotheria Averianov & Lopatin, 2011
     Infraclass †"Triconodonta" Osborn, 1888 [paraphyletic] see Order Triconodonta Osborn, 1888
       1 Order †Gobiconodonta Averianov & Lopatin, 2011
       2.1 Order †"Phascolotheria" Ameghino, 1889 [paraphyletic]
       2.2.1 Order †Amphidontoidea Prothero, 1981 [monotypic]
       2.2.2.1-n Order †Eutriconodonta Kermack, Mussett & Rigney, 1973 [sister group to excluded taxa]