Origins and Evolution of Ornithischian Dinosaurs

@article{Thulborn1971OriginsAE,
  title={Origins and Evolution of Ornithischian Dinosaurs},
  author={Richard A. Thulborn},
  journal={Nature},
  year={1971},
  volume={234},
  pages={75-78}
}
Recent discoveries in the red beds of the Upper Trias have shed light on the history of the ornithischian dinosaurs. It is suggested that these dinosaurs had a monophyletic origin among advanced pseudosuchian thecodonts. Development of their rather bird-like pelvis involved backwards rotation of the pubis and subsequent growth of a prepubis. A conservative stock of primitive-looking hypsilophodonts, which persisted from the late Trias through the Cretaceous, lay at the core of ornithischian… CONTINUE READING