Abstract
ALTHOUGH I agree with the main themes of Thulborn on the origin of ornithischian dinosaurs1–3, I disagree4–6 with the current classification of the family Hypsilophodontidae7–8, in respect to premaxillary teeth as a diagnostic feature, cheeks, cheek teeth and locomotor capabilities.
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References
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GALTON, P. Classification and Evolution of Ornithopod Dinosaurs. Nature 239, 464–466 (1972). https://doi.org/10.1038/239464a0
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DOI: https://doi.org/10.1038/239464a0
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