Abstract
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 phylogeny.
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THULBORN, R. Origins and Evolution of Ornithischian Dinosaurs. Nature 234, 75–78 (1971). https://doi.org/10.1038/234075a0
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DOI: https://doi.org/10.1038/234075a0
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