Evolution of the sabertooth mandible: A deadly ecomorphological specialization

Détails

ID Serval
serval:BIB_0C070429A323
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Evolution of the sabertooth mandible: A deadly ecomorphological specialization
Périodique
Palaeogeography, Palaeoclimatology, Palaeoecology
Auteur(s)
Piras P., Silvestro D., Carotenuto F., Castiglione S., Kotsakis A., Maiorino L., Melchionna M., Mondanaro A., Sansalone G., Serio C., Vero V.A., Raia P.
ISSN
0031-0182
Statut éditorial
Publié
Date de publication
2018
Peer-reviewed
Oui
Volume
496
Pages
166-174
Langue
anglais
Résumé
Saber-toothed cats were armed with formidable weapons. They evolved a number of highly derived morphological features, most notably a pair of extremely long upper canines, which makes them unique within the felid family. Although the sabertooth character evolved several times among carnivorous mammals, sabertooth clades mostly had disjunctive occurrences both in space and time, and no sabertooth is alive today. We studied the rates of phenotypic and taxonomic diversification in the mandible of sabertooths, as compared to the rates calculated for both extinct and extant conical toothed cats. We found that the mandible's shape and physical properties in sabertooth clades evolved at distinctly higher rates than the rest of the felid tree. In addition, sabertooths had similar speciation rate to conical toothed cats, but statistically higher extinction rate. The wealth of morphological specializations required to be a sabertooth, and their tendency to focus on large-sized species as prey, was likely responsible for such high extinction rate, and for the peculiar, disjunctive patterns of sabertooth Glade occurrence in the fossil record.
Mots-clé
Machairodontinae, Felidae, Speciation rate, Extinction rate, Phenotypic evolutionary rate, RRphylo
Web of science
Création de la notice
09/05/2018 8:41
Dernière modification de la notice
10/05/2018 6:26
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