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Vascular structure of the earliest shark teeth

Treść / Zawartość
Identyfikatory
Warianty tytułu
Konferencja
Proceedings of the 14th International Symposium on Early and Lower Vertebrates
Języki publikacji
EN
Abstrakty
EN
Here we use synchrotron tomography to characterise dental vasculature in the oldest known tooth-bearing sharks, Leonodus carlsi Mader, 1986 and Celtiberina maderi Wang, 1993. Three dimensional reconstruction of the vascular system and microstructure of both taxa revealed a complex and dense network of canals, including horizontal, ascending and secondary bifurcated canals, as well as histological features consistent with an osteodont histotype. However, L. carlsi and C. maderi also exhibit significant morphological differences, showing Leonodus a typical diplodont tooth morphology with a linguo-labially elongated base, that contrast with Celtiberina’s teeth that show a single conical cusp curved lingually with a week developed flat base mesio-distally extended, perhaps reflecting distant relationship. These data are compatible with a pre-Devonian diversification of the two main tooth types traditionally recognised in Palaeozoic sharks (i.e., “cladodont” vs “diplodont”). Finally, our data demonstrate that existing dental classification schemes based on styles of vascularisation are over-simplified, especially when Palaeozoic taxa are considered.
Rocznik
Strony
457--465
Opis fizyczny
Bibliogr. 44 poz., rys.
Twórcy
  • Cavanilles Institute of Biodiversity and Evolutionary Biology, C/University of Valencia, Valencia, Spain
  • School of Earth Sciences, University of Bristol, Life Sciences Building, 24 Tyndall Avenue, Bristol, BS8 1TQ, United Kingdom
  • Cavanilles Institute of Biodiversity and Evolutionary Biology, C/University of Valencia, Valencia, Spain
  • Cavanilles Institute of Biodiversity and Evolutionary Biology, C/University of Valencia, Valencia, Spain
autor
  • Department of Cellular Biology, Functional Biology and Physical Anthropology, and Interdisciplinary Research Structure for Biotechnology and Biomedicine-BIOTECMED, University of Valencia. C/Dr. Moliner, E-46100 Burjassot (Valencia), Spain
  • School of Earth Sciences, University of Bristol, Life Sciences Building, 24 Tyndall Avenue, Bristol, BS8 1TQ, United Kingdom
autor
  • Cavanilles Institute of Biodiversity and Evolutionary Biology, C/University of Valencia, Valencia, Spain
Bibliografia
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Uwagi
PL
Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-aac17ab2-9fc0-4b63-aab6-b6de2238afd7
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