Patterns and implications of extensive heterochrony in carnivoran cranial suture closure

Goswami, A., Foley, L. and Weisbecker, V. (2013) Patterns and implications of extensive heterochrony in carnivoran cranial suture closure. Journal of Evolutionary Biology, 26 6: 1294-1306. doi:10.1111/jeb.12127

Author Goswami, A.
Foley, L.
Weisbecker, V.
Title Patterns and implications of extensive heterochrony in carnivoran cranial suture closure
Journal name Journal of Evolutionary Biology   Check publisher's open access policy
ISSN 1010-061X
Publication date 2013-06-01
Year available 2013
Sub-type Article (original research)
DOI 10.1111/jeb.12127
Volume 26
Issue 6
Start page 1294
End page 1306
Total pages 13
Place of publication Chichester, West Sussex, United Kingdom
Publisher Wiley-Blackwell
Language eng
Abstract Heterochronic changes in the rate or timing of development underpin many evolutionary transformations. In particular, the onset and rate of bone development have been the focus of many studies across large clades. In contrast, the termination of bone growth, as estimated by suture closure, has been studied far less frequently, although a few recent studies have shown this to represent a variable, although poorly understood, aspect of developmental evolution. Here, we examine suture closure patterns across 25 species of carnivoran mammals, ranging from social-insectivores to hypercarnivores, to assess variation in suture closure across taxa, identify heterochronic shifts in a phylogenetic framework and elucidate the relationship between suture closure timing and ecology. Our results show that heterochronic shifts in suture closure are widespread across Carnivora, with several shifts identified for most major clades. Carnivorans differ from patterns identified for other mammalian clades in showing high variability of palatal suture closure, no correlation between size and level of suture closure, and little phylogenetic signal outside of musteloids. Results further suggest a strong influence of feeding ecology on suture closure pattern. Most of the species with high numbers of heterochronic shifts, such as the walrus and the aardwolf, feed on invertebrates, and these taxa also showed high frequency of closure of the mandibular symphysis, a state that is relatively rare among mammals. Overall, caniforms displayed more heterochronic shifts than feliforms, suggesting that evolutionary changes in suture closure may reflect the lower diversity of cranial morphology in feliforms.
Keyword Carnivora
Morphological diversity
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
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