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Type: Journal article
Title: Neutron scanning reveals unexpected complexity in the enamel thickness of an herbivorous Jurassic reptile
Author: Jones, M.
Lucas, P.
Tucker, A.
Watson, A.
Sertich, J.
Foster, J.
Williams, R.
Garbe, U.
Bevitt, J.
Salvemini, F.
Citation: Journal of the Royal Society Interface, 2018; 15(143):20180039-1-20180039-11
Publisher: The Royal Society
Issue Date: 2018
ISSN: 1742-5689
Statement of
Marc E. H. Jones, Peter W. Lucas, Abigail S. Tucker, Amy P. Watson, Joseph J. W. Sertich, John R. Foster, Ruth Williams, Ulf Garbe, Joseph J. Bevitt and Floriana Salvemini
Abstract: Eilenodontines are one of the oldest radiation of herbivorous lepidosaurs (snakes, lizards and tuatara) characterized by batteries of wide teeth with thick enamel that bear mammal-like wear facets. Unlike most reptiles, eilenodontines have limited tooth replacement, making dental longevity particularly important to them. We use both X-ray and neutron computed tomography to examine a fossil tooth from the eilenodontine Eilenodon (Late Jurassic, USA). Of the two approaches, neutron tomography was more successful and facilitated measurements of enamel thickness and distribution. We find the enamel thickness to be regionally variable, thin near the cusp tip (0.10 mm) but thicker around the base (0.15–0.30 mm) and notably greater than that of other rhynchocephalians such as the extant Sphenodon (0.08–0.14 mm). The thick enamel in Eilenodon would permit greater loading, extend tooth lifespan and facilitate the establishment of wear facets that have sharp edges for orally processing plant material such as horsetails (Equisetum). The shape of the enamel dentine junction indicates that tooth development in Eilenodon and Sphenodon involved similar folding of the epithelium but different ameloblast activity.
Keywords: tooth; enamel; dentine; neutron CT; X-ray CT
Rights: © 2018 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License, which permits unrestricted use, provided the original author and source are credited.
RMID: 0030090589
DOI: 10.1098/rsif.2018.0039
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Appears in Collections:Genetics publications

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