Supplementary material from "Neutron scanning reveals unexpected complexity in the enamel thickness of an herbivorous Jurassic reptile"
Version 2 2018-06-12, 06:10
Version 1 2018-05-30, 17:21
Posted on 2018-06-12 - 06:10
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.
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E. H. Jones, Marc; W. Lucas, Peter; S. Tucker, Abigail; Watson, Amy P.; J. W. Sertich, Joseph; Foster, John R.; et al. (2018). Supplementary material from "Neutron scanning reveals unexpected complexity in the enamel thickness of an herbivorous Jurassic reptile". The Royal Society. Collection. https://doi.org/10.6084/m9.figshare.c.4117052.v2
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AUTHORS (10)
ME
Marc E. H. Jones
PW
Peter W. Lucas
AS
Abigail S. Tucker
AW
Amy P. Watson
JJ
Joseph J. W. Sertich
JF
John R. Foster
RW
Ruth Williams
UG
Ulf Garbe
JB
Joseph J. Bevitt
FS
Floriana Salvemini