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White-Cheeked Spider Monkey, Brazil (USNM 544519)
New World monkeys are primates and are more closely related to humans, apes and Old World monkeys than any other living nonhuman primate group. The Smithsonian Institution’s Division of Mammals (http://vertebrates.si.edu/mammals/) houses many New World monkeys in its scientific collections.
This specimen, USNM 544519 (http://collections.nmnh.si.edu/search/mammals/?irn=7412186), is a female white-cheeked spider monkey (Ateles marginatus) from Brazil. This individual was collected in 1973 in the Para province. This specimen weighed 8.290 kg, measured a total length of 1,240 mm, a tail length of 750 mm, a hind tarsus length of 170 mm, and an ear notch length of 35 mm.
This is a CT scan of the cranium of USNM 544519. 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.