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- Title
Circumfacial Markings in Siamang and Evolution of the Face Ring in the Hylobatidae.
- Authors
Geissmann, Thomas
- Abstract
The occurrence of a white brow band in siamang is documented for the first time. The characteristic occurs in 4.4% of 250 siamang. Among adult siamang the characteristic occurs more often in females than in males (11.3% of 71 females vs. 1.4% of 73 males). In a particular family lineage of captive siamang (not included in the numbers above), the characteristic was unusually frequent (42.9% of 14). The trait appears to be inherited, possibly as an autosomal dominant inheritance. Additional white markings occur in at least one of the subjects on hands, feet, and in a corona above the ears. In contrast to other studies, our results suggest that the presence of white facial markings, and possibly also of white hands and feet and of a bright corona are primitive gibbon traits. In addition, some degree of sexual dichromatism in the circumfacial markings appears to have occurred in the common ancestor of all gibbons.
- Subjects
SIAMANG; GIBBONS; ANIMAL tagging
- Publication
International Journal of Primatology, 2003, Vol 24, Issue 1, p143
- ISSN
0164-0291
- Publication type
Article
- DOI
10.1023/A:1021454714181