Tetraceratops
In Depth Tetraceratops has proven a headache for palaeontologists since its discovery, as it is either a pelycosaur, or potentially an early form of the coming therapsids that would displace the pelycosaurs as dominant predators. Evidence to support the therapsid theory comes from similarities in the temporal fenestra between Tetraceratops and biarmarosuchians, primitive therapsids that … Read more