Fig. 2From: Evolutionary Transitions Among Dinosaurs: Examples from the Jurassic of ChinaCeratopsian dinosaurs, showing specialized ceratopsids and more primitive species with transitional features. a–f Skulls of ceratopsids: aCentrosaurus apertus; bEiniosaurus procurvicornis; c, eStyracosaurus albertensis; dAchelousaurus horneri; fPachyrhinosaurus canadensis. g skeleton of Protoceratops andrewsi; h skeleton of Psittacosaurus mongoliensisBack to article page