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Silvery Lutung, Indonesia (USNM 113174)
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 113174 (http://collections.mnh.si.edu/search/mammals/?irn=7243265), is a female silvery lutung (Trachypithecus cristatus cristatus) from Indonesia. This individual was collected in 1901 by William Abbott near Indragiri River on the island of Sumatra. This individual weighed 11 lbs, had a total length of 1110 mm, a tail length of 700 mm, and a head to body length of 410 mm.
This is a CT scan of the mandible of USNM 113174. 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.