Vascular structure of the earliest shark teeth

Carlos Martinez-Perez, Alba Martin-Lazaro, Humberto G Ferron, Martina Kirstein, Philip Donoghue, Hector Botella

Research output: Contribution to journalArticle (Academic Journal)peer-review

2 Citations (Scopus)
55 Downloads (Pure)

Abstract

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.
Original languageEnglish
Pages (from-to)457-465
Number of pages9
JournalActa Geologica Polonica
Volume68
Issue number3
Early online date26 Sep 2018
DOIs
Publication statusPublished - 2018

Keywords

  • Leonodus
  • Vascular system
  • Synchrotron tomography
  • Lower Devonian
  • Early chondrichthyans
  • Celtiberina

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