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Lutang, Thailand (USNM 257685)
Old World monkeys are primates and are more closely related to humans and apes than any other living nonhuman primate group. The Smithsonian Institution’s Division of Mammals (http://vertebrates.si.edu/mammals/) houses many Old World monkeys in its scientific collections.
This specimen, USNM 257685 (http://collections.mnh.si.edu/search/mammals/?irn=7289421), is a female silvery lutung (Trachypithecus cristatus cristatus) from Thailand. This individual was collected in 1931 by H. M. Smith near Pak Jong.
This is a CT scan of the mandible of USNM 257685. These three-dimensional scans are made publicly available through the generous support of the Smithsonian 2.0 Fund, provided from the annual gifts of the Smithsonian National Board to the Secretary to use at his discretion (http://smithsonian20.si.edu/fund.html), and the Smithsonian Collections Care and Preservation Fund.