Mammaliaformes Rowe 1988 [crown] Class Mammalia Linnaeus, 1758 - mammals Subclass Theriiformes Rowe, 1988 see Division Theriiformes Rowe, 1988 Infraclass †Triconodonta Osborn, 1888 see Order Triconodonta Osborn, 1888 1 Genus †Hallautherium Clemens, 1980 2 Family †Austrotriconodontidae Bonaparte, 1992 3 Family †Amphilestidae Osborn, 1888 4 Family †Triconodontidae Marsh, 1887