During the Triassic, archosaurs displaced therapsids as the dominant amniotes. They consist of all synapsids excluding the therapsids and their descendants. Late in the Permian therapsids became the dominant large-bodied terrestrial vertebrates. Therocephalia is an extinct suborder of eutheriodont therapsids from the Permian and Triassic. Purlovia is an extinct genus of herbivorous therocephalian therapsids from the Late Permian of Russia. The therapsids had sprawling forelimbs and semi-erect hindlimbs. These respectively evolved from dinosaurs and from early therapsids, which were both traditionally called reptiles. Cynognathus is an extinct genus of large-bodied cynodontian therapsids that lived in the Middle Triassic. They were replaced by much smaller therapsids; herbivorous Dicynodontia and carnivorous Biarmosuchians, Gorgonopsians and Therocephalians. Recent studies on Permian coprolites showcase that hair was present in at least some therapsids. Synapsida is a clade that includes pelycosaurs, therapsids, and modern mammals. It is absent in mammals, but was present in their closest extinct relatives, the therapsids. Pelycosauria is a paraphyletic taxon because it excludes the therapsids. Gorgonopsians are theriodonts, a major group of therapsids that included the ancestors of mammals. The arrival of the therapsids resulted in the first plant-vertebrate-insect ecosystem.