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• W2593250722 endingPage "e0172759" @default.
• W2593250722 startingPage "e0172759" @default.
• W2593250722 abstract "Elasmosaurid plesiosaurians were globally prolific marine reptiles that dominated the Mesozoic seas for over 70 million years. Their iconic body-plan incorporated an exceedingly long neck and small skull equipped with prominent intermeshing 'fangs'. How this bizarre dental apparatus was employed in feeding is uncertain, but fossilized gut contents indicate a diverse diet of small pelagic vertebrates, cephalopods and epifaunal benthos. Here we report the first plesiosaurian tooth formation rates as a mechanism for servicing the functional dentition. Multiple dentine thin sections were taken through isolated elasmosaurid teeth from the Upper Cretaceous of Sweden. These specimens revealed an average of 950 daily incremental lines of von Ebner, and infer a remarkably protracted tooth formation cycle of about 2-3 years-other polyphyodont amniotes normally take ~1-2 years to form their teeth. Such delayed odontogenesis might reflect differences in crown length and function within an originally uneven tooth array. Indeed, slower replacement periodicity has been found to distinguish larger caniniform teeth in macrophagous pliosaurid plesiosaurians. However, the archetypal sauropterygian dental replacement system likely also imposed constraints via segregation of the developing tooth germs within discrete bony crypts; these partly resorbed to allow maturation of the replacement teeth within the primary alveoli after displacement of the functional crowns. Prolonged dental formation has otherwise been linked to tooth robustness and adaption for vigorous food processing. Conversely, elasmosaurids possessed narrow crowns with an elongate profile that denotes structural fragility. Their apparent predilection for easily subdued prey could thus have minimized this potential for damage, and was perhaps coupled with selective feeding strategies that ecologically optimized elasmosaurids towards more delicate middle trophic level aquatic predation." @default.
• W2593250722 created "2017-03-16" @default.
• W2593250722 creator A5001749877 @default.
• W2593250722 creator A5052409929 @default.
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• W2593250722 date "2017-02-27" @default.
• W2593250722 modified "2023-10-16" @default.
• W2593250722 title "Exceptionally prolonged tooth formation in elasmosaurid plesiosaurians" @default.
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• W2593250722 doi "https://doi.org/10.1371/journal.pone.0172759" @default.
• W2593250722 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5328283" @default.
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• W2593250722 hasPublicationYear "2017" @default.
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