Dynamics of dental evolution in ornithopod dinosaurs

Edward Strickson, Albert Prieto-Márquez, Michael J Benton, Thomas L Stubbs

Research output: Contribution to journalArticle (Academic Journal)peer-review

11 Citations (Scopus)
344 Downloads (Pure)

Abstract

Ornithopods were key herbivorous dinosaurs in Mesozoic terrestrial ecosystems, with a variety of tooth morphologies. Several clades, especially the 'duck-billed' hadrosaurids, became hugely diverse and abundant almost worldwide. Yet their evolutionary dynamics have been disputed, particularly whether they diversified in response to events in plant evolution. Here we focus on their remarkable dietary adaptations, using tooth and jaw characters to examine changes in dental disparity and evolutionary rate. Ornithopods explored different areas of dental morphospace throughout their evolution, showing a long-term expansion. There were four major evolutionary rate increases, the first among basal iguanodontians in the Middle-Late Jurassic, and the three others among the Hadrosauridae, above and below the split of their two major clades, in the middle of the Late Cretaceous. These evolutionary bursts do not correspond to times of plant diversification, including the radiation of the flowering plants, and suggest that dental innovation rather than coevolution with major plant clades was a major driver in ornithopod evolution.

Original languageEnglish
Article number28904
JournalScientific Reports
Volume6
DOIs
Publication statusPublished - 14 Jul 2016

Keywords

  • Palaeontology

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