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Brown Howler Monkey, Brazil (USNM 518252)
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 518252 (http://collections.nmnh.si.edu/search/mammals/?irn=7389725), is a female brown howler monkey (Alouatta guariba) from Brazil. This individual was collected by De Souza in 1948 near Santa Catarina Province. This specimen weighed 5,000 g, measured a total length of 1,060 mm, a tail length of 550 mm, a hind tarsus length of 129 mm, an ear notch length of 35 mm and a head to body length of 510 mm.
This is a CT scan of the cranium of USNM 518252. 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.