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Guyanan Red Howler Monkey, Brazil (USNM 546248)
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 546248 (http://collections.nmnh.si.edu/search/mammals/?irn=7413915), is a male Guyanan red howler monkey (Alouatta macconnelli) from Brazil. This individual was collected in 1976 in Oriximinia, Cachoeira Portiera in Para Province. This specimen weighed 6,400 g, measured a total length of 1,190 mm, with a tail length of 600 mm, a hind tarsus length of 145 mm, and an ear notch length of 35 mm.
This is a CT scan of the mandible of USNM 546248. 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.
The main goal of this joint initiative between the Human Origins Program and the Division of Mammals is to make the NMNH's scientific collections of our closest living nonhuman primate relatives available in 3D for education and research.