Dissertation/Thesis Abstract

Morphological Differences in Mandible Form between Common Marmosets (Callithrix jacchus) and Cotton-Top Tamarins (Saguinus oedipus)
by Shelton, Susan, M.S., Southern Illinois University at Edwardsville, 2018, 91; 10843892
Abstract (Summary)

Mandible form in cotton-top tamarins (Saguinus oedipus) and common marmosets (Callithrix jacchus) provides insight into effects of dietary differences. Mandible shape is due to both genetic factors as well as environmental, with functional differences included in the environmental (Klingenberg and Leamy, 2001). Forces associated with differences in food acquisition can be expected to lead to morphological changes. Common marmosets (Callithrix jacchus ) and cotton-top tamarins (Saguinus oedipus) have different feeding styles, and therefore, have different mandible and other craniofacial adaptations. Whether these taxa are wild-born or lab-born could also affect their mandible form. There is a lack of agreement whether there is sexual dimorphism between these two species, but this study indicates there is sexual dimorphism even after adjusting for size. Standardized lateral and superior views of mandible photographs of both species were analyzed at different mandibular regions and individual dimensions. Not only did it reveal intraspecific and interspecific sexual dimorphism, there is also a difference in mandible form whether a species is wild-born or lab-born. S. oedipus males and females are larger if born in the wild and C. jacchus are larger if born in the lab. This could have implications in the future on how lab-born monkeys are being cared for and fed to better mimic their natural habitat.

Indexing (document details)
Advisor: Kohn, Luci
Commitee: Schulz, Kurt, Williams, Jason
School: Southern Illinois University at Edwardsville
Department: Biological Sciences
School Location: United States -- Illinois
Source: MAI 58/01M(E), Masters Abstracts International
Subjects: Biology
Publication Number: 10843892
ISBN: 978-0-438-30013-2
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