Cover

Comparative Dental Morphology

14th International Symposium on Dental Morphology, Greifswald, August 2008: Selected papers

Editor(s): Koppe T. (Greifswald) 
Meyer G. (Greifswald) 
Alt K.W. (Mainz) 
Brook A. (Liverpool) 
Dean M.C. (London) 
Kjaer I. (Copenhagen) 
Lukacs J.R. (Eugene, Oreg.) 
Smith B.H. (Ann Arbor, Mich.) 
Teaford M.F. (Baltimore, Md.) 
Table of Contents
Vol. 13, No. , 2009
Section title: Dental Evolution
Koppe T, Meyer G, Alt KW (eds): Comparative Dental Morphology. Front Oral Biol. Basel, Karger, 2009, vol 13, pp 9–15
(DOI:10.1159/000242382)

Dentary Tooth Shape in Sphenodon and Its Fossil Relatives (Diapsida: Lepidosauria: Rhynchocephalia)

Jones M.E.H.
Research Department of Cell and Developmental Biology, UCL, University College London, London, UK

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Article / Publication Details

First-Page Preview
Abstract of Dental Evolution

Published online: 9/21/2009
Cover Date: 2009

Number of Print Pages: 7
Number of Figures: 0
Number of Tables: 0

ISBN: 978-3-8055-9229-1 (Print)
eISBN: 978-3-8055-9230-7 (Online)

Abstract

Background: Today Rhynchocephalia, the sister tax-on to Squamata (snakes, lizards and amphisbaenians), is only represented by the tuatara (Sphenodon) of New Zealand. However, for much of the Mesozoic, the group was speciose and globally distributed. Historically, the Rhynchocephalia were considered to be homogenous and unspecialized but new fossils and new research are overturning this view. As well as differences in body size, body proportions, habit (aquatic vs. terrestrial), and skull structure, their teeth show variation in shape, size, number, arrangement and enamel thickness. This suggests differences in diet and mode of feeding. The teeth of basal taxa tend to be relatively simple and conical, whereas those of derived taxa possess complex flanges and wear facets. Methods: Dimensions of the dentary tooth bases were measured in apical view for a large sample of rhynchocephalian taxa. Results: These measurements reveal three general tooth types: small ovoid teeth, large wide teeth, and large elongate teeth. Conclusion: These three categories correspond to food processing as inferred from tooth wear (puncturing+crushing, grinding+shredding and tearing+cutting, respectively). A phylogenetic signal is also present as the teeth of basal taxa generally conform to the first category. The larger tooth bases of derived taxa provide stronger attachment and contribute to a stouter tooth shape more resistant to loading and torsional forces. This in turn corresponds to skull architecture because the skulls of derived taxa could accommodate larger jaw muscles with a greater leverage relative to basal taxa.

© 2009 S. Karger AG, Basel


  

Author Contacts

Dr. Marc E.H. Jones, Research Department of Cell and Developmental Biology, University College London, Gower Street, UCL, London WCIE 6BT (UK), Tel. +44 20 7679 7698, Fax +44 20 7679 7349, E-Mail marc.jones@ucl.ac.uk

  

Article Information

Number of Print Pages : 7

  

Publication Details

Book Serie: Frontiers of Oral Biology, Vol. 13, Year 2009

Editor(s): Koppe, T. (Greifswald); Meyer, G. (Greifswald); Alt, K.W. (Mainz); Brook, A. (Liverpool); Dean, M.C. (London); Kjaer, I. (Copenhagen); Lukacs, J.R. (Eugene, Oreg.); Smith, B.H. (Ann Arbor, Mich.); Teaford, M.F. (Baltimore, Md.)
ISSN: 1420-2433 (Print), eISSN: 1662-3770 (Online)

For additional information:
http://content.karger.com/ProdukteDB/produkte.asp?issn=1420-2433

Book Title: Comparative Dental Morphology (14th International Symposium on Dental Morphology, Greifswald, August 2008: Selected papers)

Editor(s): Koppe T, Meyer G, Alt KW (eds)

For additional information:
http://content.karger.com/ProdukteDB/produkte.asp?issn=1420-2433&volume=13


Article / Publication Details

First-Page Preview
Abstract of Dental Evolution

Published online: 9/21/2009
Cover Date: 2009

Number of Print Pages: 7
Number of Figures: 0
Number of Tables: 0

ISBN: 978-3-8055-9229-1 (Print)
eISBN: 978-3-8055-9230-7 (Online)


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