Class Mammalia Linnaeus, 1758 - mammals
   Subclass †"Apotheria" Averianov & Lopatin, 2011 [paraphyletic]
     Superorder †"Archaeotriconodonta" Averianov & Lopatin, 2011 [paraphyletic]
       Order †Morganucodonta Kermack, Mussett & Rigney, 1973 [paraphyletic]
         1 Genus †Morganucodon Kühne, 1949
         2 Genus †Erythrotherium Crompton, 1964
         3.1-n Genus †Megazostrodon Crompton & Jenkins, 1968 [sister group to excluded taxa]