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Neutron scanning reveals unexpected complexity in the enamel thickness of an herbivorous Jurassic reptile

Jones, MEH; Lucas, PW; Tucker, AS; Watson, AP; Sertich, JJW; Foster, JR; Williams, R; ... Salvemini, F; + view all (2018) Neutron scanning reveals unexpected complexity in the enamel thickness of an herbivorous Jurassic reptile. Journal of The Royal Society Interface , 15 (143) , Article 20180039. 10.1098/rsif.2018.0039. Green open access

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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.

Type: Article
Title: Neutron scanning reveals unexpected complexity in the enamel thickness of an herbivorous Jurassic reptile
Open access status: An open access version is available from UCL Discovery
DOI: 10.1098/rsif.2018.0039
Publisher version: http://doi.org/10.1098/rsif.2018.0039
Language: English
Additional information: Copyright & 2018 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Cell and Developmental Biology
URI: https://discovery.ucl.ac.uk/id/eprint/10071185
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