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Howler Monkey, Mexico (USNM 177545)
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 177545 (http://collections.mnh.si.edu/search/mammals/?irn=7261968), is a male black howler monkey (Alouatta villosa pigra) from Mexico. This individual was collected by R. W. Shufeldt in 1911 near La Tuxpena located in Champoton Municipality of Campeche. This specimen had a total length of 1,206 mm, a tail length of 640 mm and a hind tarsus length of 143 mm.
This is a CT scan of the mandible of USNM 177545. 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.