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
       1 Infraclass †Allotheria Marsh, 1880 see [unranked] Allotheria
       2 Infraclass †Triconodonta (Osborn, 1888) Vandebroek, 1964 see Order Triconodonta Osborn, 1888
       3 Infraclass Holotheria (Wible et al., 1995) M.C. McKenna & S.K. Bell, 1997 see [unranked] Holotheria