article: Therapsid
links: Cynodontia Theriodont Synapsida Upper Triassic Robert Broom Lystrosaurus Lower Cretaceous Therocephalia Dicynodont Sauropsid Clade Morganucodon Cisuralian Tritylodont Holocene Gorgonopsia Pelycosaur P/Tr extinction event Mammal Mammaliaformes Theriodontia Cynodont Pangea Triassic