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Teeth of extant Polypteridae and Amiidae have plicidentine organization
Author(s) -
Germain Damien,
Meunier François J.
Publication year - 2019
Publication title -
acta zoologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.414
H-Index - 37
eISSN - 1463-6395
pISSN - 0001-7272
DOI - 10.1111/azo.12237
Subject(s) - biology , extant taxon , sister group , dentition , anatomy , fixation (population genetics) , zoology , phylogenetic tree , evolutionary biology , clade , paleontology , gene , genetics
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.