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Langur, Indonesia (USNM 121668)
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 121668 (http://collections.mnh.si.edu/search/mammals/?irn=7245548), is a male Mentawai langur (Presbytis potenziani potenziani) from Indonesia. This individual was collected in 1902 by William Abbott on South Pagi Island of the Mentawai Island archipelago off the West coast of Sumatra. This individual weighed 15 lbs, had a total length of 1125 mm, a tail length of 610 mm, and a head to body length of 515 mm.
This is a CT scan of the mandible of USNM 121668. 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.