In shark teeth we have identified the species fluorapatite, hydroxyfluorapatite and its defect site, calcium fluoride, and potassium fluoride. Their relative amounts in teeth at different development stages have been quantified. Calcium fluoride and potassium fluoride may be associated with the fluoridation mechanism in shark teeth.
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New insights on the shell-crusher shark Agassiz, 1838 (Elasmobranchii, Ptychodontidae) based on the first known articulated dentition from the Upper Cretaceous of Croatia.
Swiss J Palaeontol
January 2025
Department of Palaeontology, Geozentrum, University of Vienna, Josef-Holaubek-Platz 2, 1090 Vienna, Austria.
Unlabelled: A new lower tooth plate of from the Turonian (Upper Cretaceous) of the Dalmatian region (southern Croatia) is documented here for the first time. The specimen represents the first articulated dentition of a ptychodontid shark that has been discovered from the Balkan Peninsula and the most complete ever found for the un-cuspidate species up to now. The reconstruction of the entire lower dentition of based on this exceptionally well-preserved dentition shows a wider crushing plate than previously hypothesised with bulgy teeth limited to the central area.
View Article and Find Full Text PDFThe movement and distribution of pregnant spotted ragged-tooth sharks, , in the iSimangaliso Wetland Park, South Africa.
PeerJ
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Wildtrust, Pietermaritzburg, KwaZulu-Natal, South Africa.
The spotted ragged-tooth shark, , is widely distributed in subtropical continental coastal seas. In South Africa, it is commonly found along the entire south and east coasts, including the iSimangaliso Wetland Park (IWP) in the far north, which is the largest Marine Protected Area on the South African coast. Pregnant females occur there for much of the year, with the largest aggregations in summer.
View Article and Find Full Text PDFArticle Synopsis
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Department of Biological Sciences, DePaul University, Chicago, Illinois, USA, Department of Environmental Science and Studies, DePaul University, Chicago, Illinois, USA, and Sternberg Museum of Natural History, Fort Hays State University, Hays, Kansas, USA.
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