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Dynamics of dental evolution in ornithopod dinosaurs.

Strickson, E and Prieto-Márquez, A and Benton, MJ and Stubbs, TL (2016) Dynamics of dental evolution in ornithopod dinosaurs. Scientific Reports, 6. ISSN 2045-2322

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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.

Item Type: Article
Subjects: Q Science > QH Natural history
Q Science > QH Natural history > QH301 Biology
Q Science > QK Botany
Divisions: Natural Sciences and Psychology
Publisher: NATURE PUBLISHING GROUP
Related URLs:
Date Deposited: 02 Sep 2016 10:59
Last Modified: 07 Sep 2017 06:20
DOI or Identification number: 10.1038/srep28904
URI: http://researchonline.ljmu.ac.uk/id/eprint/4084

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