期刊
JOURNAL OF MORPHOLOGY
卷 272, 期 2, 页码 129-135出版社
WILEY
DOI: 10.1002/jmor.10898
关键词
Ichthyosauria; Platypterygius; tooth histology; cementum
资金
- I.W. Killam Memorial Postdoctoral Fellowship
- University of Alberta, Chair's Research Allowance
- NSERC [238458-01]
Ichthyosaurs are an extinct group of secondarily aquatic reptiles that show ligamentous tooth attachment to the jaw in some derived forms. Here, we provide a modern description of tooth histology in ichthyosaurs, using Platypterygius australis, a large ichthyosaur from the Cretaceous of Australia Our study supports evolutionary conservation of the principal mineralized tooth tissue types in amniotes with ligamentous tooth attachment: enamel, dentine, cellular, and acellular cementum. This is the first time that the latter tissue has been located in ichthyosaurs. Vascularized cementum (osteocementum) is reduced or absent in amniotes in which the teeth are ankylosed to the jaw bone, such as basal ichthyosaurs, and raises questions regarding the function of this tissue and the potential developmental or selective conditions leading to its convergent evolution. J. Morphol. 272:129-135,2011. (C) 2010 Wiley-Liss, Inc.
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