Clade Cynodontia Owen 1861 [Gauthier, Kluge & Rowe 1988], nom. cl. inval. see Clade Cynodontia Owen 1861 [Rowe 2020] Clade Epicynodonts Hopson & Kitching 2001 Clade Eucynodontia Kemp 1982 [Rowe 1993] Clade Mammaliamorpha Rowe 1988, nom. cl. inval. see Clade Mammaliamorpha Rowe 1988 [Rowe 2020] Class Mammalia Linnaeus, 1758 - mammals Clade Trechnotheria McKenna 1975 Clade Cladotheria McKenna 1975 Clade Zatheria McKenna 1975 Subclass Boreosphenida Luo, Cifelli & Kielan-Jaworowska, 2001 - tribotherians see Clade Boreosphenida Luo, Cifelli & Kielan-Jaworowska 2001 Infraclass Metatheria Huxley, 1880 Genus †Alphadon Simpson, 1927