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 3–8
(DOI:10.1159/000242381)

Phylogeny, Life History and the Timing of Molar Crown Formation in Two Archaic Ungulates, Meniscotherium and Phenacodus (Mammalia, ‘Condylarthra’)

Dirks W.a · Anemone R.L.b · Holroyd P.A.c · Reid D.J.a · Walton P.a
aSchool of Dental Sciences, Newcastle University, Newcastle upon Tyne, UK; bDepartment of Anthropology, Western Michigan University, Kalamazoo, Mich., and cMuseum of Paleontology, University of California, Berkeley, Calif., USA

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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: 6
Number of Figures: 0
Number of Tables: 0

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

Abstract

The condylarths, or archaic ungulates, are a paraphyletic mammalian group including a number of fossil taxa whose relationships are unresolved. Included are two genera from the Paleocene and Eocene of North America, Meniscotherium and Phenacodus. Some workers place both genera in the family Phenacodontidae, while others exclude the highly dentally derived Meniscotherium. In this study, we use growth increments in histological thin sections to examine the timing of crown formation in five molars of Meniscotherium and one each of Phenacodusintermedius and Phenacodus trilobatus. We also use perikymata counts on an additional six molars of Meniscotherium. Although estimated body mass and molar dimensions in Meniscotherium are smaller than in either species of Phenacodus, molar formation times are longer, ranging from 0.71 to 1.44 years. Both Phenacodus molars take less than a year to form. Crown extension rates, the rate at which the crown grows in height, are as low as 3–15 μm per day in Meniscotherium, but range from 13 to 54 μm per day in Phenacodus. Although striae periodicities and daily enamel secretion rate are similar in both genera, the differences in the crown extension rate and overall timing of crown formation suggest differences in life histories and raise questions about the phylogenetic relationship of the two genera.

© 2009 S. Karger AG, Basel


  

Article Information

Number of Print Pages : 6

  

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: 6
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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