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
1 Order †"Amphitheria" Kermack, Kermack & Mussett, 1968 [paraphyletic]
see Order Amphitheriida Prothero, 1981