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Histological study of the jaw teeth in the Devonian actinopterygian †Cheirolepis canadensis (Whiteaves)

Abstract : †Cheirolepis bears two series of teeth on its jaws: one with sharp caniniform teeth and a second one with smaller teeth. The good preservation of the fossil material from Miguasha (Canada) has allowed a histological study of the various tissues of teeth and jaws. Caniniform teeth are composed of a core of orthodentine with an apical cap of acrodine. The walls of the pulp cavity show incipient folds located at the tooth base. These folds are considered a primitive type of plicidentine whose function was to reinforce the attachment of the teeth, given that this taxon is being considered as a predator. The jaws are composed of cellular bone that shows evidence of limited remodelling.
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https://hal.archives-ouvertes.fr/hal-02100147
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Submitted on : Monday, April 15, 2019 - 3:51:07 PM
Last modification on : Tuesday, November 16, 2021 - 5:14:16 AM

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François J. Meunier, Olga Otero, Michel Laurin. Histological study of the jaw teeth in the Devonian actinopterygian †Cheirolepis canadensis (Whiteaves). Cybium : Revue Internationale d’Ichtyologie, Paris : Muséum national d'histoire naturelle, 2018, pp.67-74. ⟨10.26028/cybium/2018-421-005⟩. ⟨hal-02100147⟩

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