Abstract # 122:

Scheduled for Sunday, September 14, 2014 04:15 PM-04:30 PM: Session 19 (Decatur A) Oral Presentation


CRANIAL MORPHOLOGY OF HYBRIDISING MACAQUES (GENUS MACACA) IN SOUTHERN CHINA AND JAPAN

C. Boel and D. Curnoe
University of New South Wales, Evolution and Ecology Research Centre, School of Biological, Earth and Environmental Sciences, Kensington, NSW 2052, Australia
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     The ability to identify primate hybrids based upon skeletal morphology alone has enormous potential for application in primatological, palaeontological and even palaeoanthropological research, but has proven to be notoriously difficult. Hybrid morphology might be intermediate between parents, closer to one or significantly different to both, and hybrids might display any combination of heterotic or dysgenetic traits. This research addresses the theory that an increased prevalence of developmental abnormalities in the primate skull may be indicative of hybrid origin. Data are gathered from two collections of Macaca skeletal remains in southern China and Japan and include data from known hybrids of various crosses, known pure species and individuals of unknown ancestry. The sample spans 9 species but concentrates on M. mulatta and M. fascicularis (China) and M. fuscata and M. cyclopis (Japan). On each specimen, 67 landmarks on the cranium and 21 landmarks on the mandible are recorded using a microscribe for shape analysis using 3D morphometrics, and the presence or absence of non-metric developmental abnormalities are recorded. Some developmental abnormalities (predominantly in the sutures and dentition) appear at frequencies above normal population levels in some groups, but the results don’t necessarily support the hypothesis that the appearance of these developmental abnormalities can be linked to hybridity, leading to the development of alternative hypotheses.