Clade Cynodontia Owen 1861 [Gauthier, Kluge & Rowe 1988]
Clade Epicynodonts Hopson & Kitching 2001
Clade Eucynodontia Kemp 1982 [Rowe 1993]
Clade Mammaliamorpha Rowe 1988
Class Mammalia Linnaeus, 1758 - mammals
Clade Yinotheria Chow & Rich 1982 [Kielan-Jaworowska, Cifelli & Luo 2004]
Subclass Australosphenida Luo, Cifelli & Kielan-Jaworowska, 2001
see Clade Australosphenida Luo, Cifelli & Kielan-Jaworowska 2001
Order Monotremata Bonaparte, 1837 - monotremes
Family †Steropodontidae Flannery, Archer, Rich & Jones, 1995