Teeth of extant Polypteridae and Amiidae have plicidentine organization

TitreTeeth of extant Polypteridae and Amiidae have plicidentine organization
Type de publicationJournal Article
Year of Publication2019
AuteursGermain, D, Meunier, FJ
JournalActa Zoologica
Mots-clés3D tomography, Amia, plicidentine, Polypterus, tooth, virtual histology

Abstract The study of teeth of the lower jaws of Amia calva and Polypterus senegalus, with non -destructive X-ray tomography, has revealed that there are dentine folds in the tooth pulp cavity in both species. These folds are simple and present only in the base of the pulp cavity where they strengthen the fixation of teeth on the jaw. So the teeth of these two basal actinopterygian taxa have a simplexodont type of plicidentine like the extinct †Cheirolepis and various extant teleostean predators, whereas the extant Lepisosteids, the sister group of Amiidae, have polyplocodont plicidentine. The phylogenetic/adaptive significance of this simplexodont plicidentine is discussed.