Class Mammalia Linnaeus, 1758 - mammals
   Subclass Acrotheria Averianov & Lopatin, 2011
     Infraclass Zatheria McKenna, 1975 see Clade Zatheria McKenna 1975
       Superlegion "Prototheria" Gill, 1872 [paraphyletic] see Subclass Prototheria Gill, 1872
         Legion †"Prototribosphenida" Wible, Rougier, Novacek, McKenna & Dashzeveg, 1995 [paraphyletic] see Clade Prototribosphenida Wible, Rougier, Novacek, McKenna & Dashzeveg 1995
           Order †"Amphitheria" Kermack, Kermack & Mussett, 1968 [paraphyletic] see Order Amphitheriida Prothero, 1981
             1-n Family †Amphitheriidae Owen, 1846 [sister group to excluded taxa]