Clade Mammaliaformes Rowe 1988 [Rowe 1988] [crown] Class Mammalia Linnaeus, 1758 - mammals Subclass Theriiformes (Rowe, 1988) M.C. McKenna & S.K. Bell, 1997 see Division Theriiformes Infraclass Holotheria (Wible et al., 1995) M.C. McKenna & S.K. Bell, 1997 see [unranked] Holotheria 1 ?Family †Chronoperatidae Fox et al., 1992 2 Superlegion †Kuehneotheria McKenna, 1975 see [unranked] Kuehneotheria 3 Superlegion Trechnotheria McKenna, 1975 see [unranked] Trechnotheria McKenna, 1975