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Craniofacial Adaptations to Tree-Gouging Among Marmosets
Version of Record online: 1 NOV 2011
Copyright © 2011 Wiley Periodicals, Inc.
The Anatomical Record
Special Issue: Evolutionary and Functional Morphology of New World Monkeys
Volume 294, Issue 12, pages 2131–2139, December 2011
How to Cite
Forsythe, E. C. and Ford, S. M. (2011), Craniofacial Adaptations to Tree-Gouging Among Marmosets. Anat Rec, 294: 2131–2139. doi: 10.1002/ar.21500
- Issue online: 15 NOV 2011
- Version of Record online: 1 NOV 2011
- Manuscript Accepted: 16 SEP 2011
- Manuscript Received: 14 SEP 2011
- jaw gape;
- platyrrhine primates
Many primates rely on exudates as dietary items, but comparatively few elicit exudates via tree-gouging. Marmosets are the only haplorhines to extensively utilize this behavior during feeding. Several studies have explored craniofacial adaptations to this behavior, but its morphological correlates are a matter of debate. Various studies suggest that gougers exhibit bite-force maximizing adaptations, load resistance adaptations, and/or jaw-gape maximizing characteristics. All of these seemingly incompatible biomechanical adaptations have previously been argued for marmosets. This study utilizes multivariate and univariate analyses to compare gouging and non-gouging callitrichids for 25 biomechanically relevant craniofacial variables to address this form–function debate. We show that marmosets differ from non-gouging callitrichids in few craniofacial characteristics. Specifically, three craniofacial features differentiate them from non-gougers: relatively longer basicrania, narrower palates, and shorter coronoid processes. We suggest that these characteristics are consistent with a mosaic model for gouging adaptations. In particular, we argue that: (a) shortening the coronoid processes facilitates relatively larger maximum jaw-gapes, (b) basicranial elongation facilitates the extended neck/head posture utilized by marmosets during gouging to maximize gapes, and (c) narrowing the palate serves to more effectively dissipate forces through the maxillary canines during substrate anchoring. Previous studies have documented some of these characters as typical of marmosets, but this combination has not been interpreted as core elements of the marmoset adaptive complex. Marmosets exhibit a unique anatomical repertoire that biomechanically adapts them to both increased jaw-gape and the force dissipation regime associated with tree-gouging. Comparisons among marmoset taxa may enlighten the evolutionary history of the features reported here. Anat Rec,, 2011. © 2011 Wiley Periodicals, Inc.