Ateles belzebuth; Print; The white-bellied spider monkey (Ateles belzebuth); also known as the white-fronted or long-haired spider monkey; is an endangered species of spider monkey; a type of New World monkey. It is found in the north-western Amazon in Colombia; Ecuador; Venezuela; Peru and Brazil; ranging as far south as the lower Ucayali River and as far east as the Branco River. In the past; the Peruvian; brown and white-cheeked spider monkeys have been treated as subspecies of A. belzebuth. As presently defined; the white-bellied spider monkey is monotypic. It has a whitish belly and a pale patch on the forehead; which; despite its common name; often is orange-buff. They live in groups of 20 to 40 individuals; splitting into small parties of 1 to 9 when in activity.; 1700-1880