page_title: White-bellied spider monkey
section_title: Dentition
hierarchical_section_title: White-bellied spider monkey / Dentition
caption_attribution_description: English: White-bellied spider monkey (Ateles belzebuth) in Equatorian Amazon.
context_page_description: The white-bellied spider monkey, 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.
  Vernacular names include mono prieto, mico prieto and marimonda.
  Over the last 45 years, the population has declined by approximately 50% due to habitat loss and hunting. Because of this, A. belzebuth is listed as endangered by the IUCN.
context_section_description: Ateles belzebuth has a dental formula of 2.1.3.3.   As far as patterns within the teeth, there is a lot of variation but the following are often found within Ateles.   Larger incisors and small molars reflect the largely frugivorous diet, with a diastema separating the upper canines from the upper incisors, for the lower incisor. The upper premolars have one to two cusps, with the first premolar having only one cusp, a paracone.  The second premolar has a paracone and protocone cusp connected by transverse crest.  The third premolar has three cusps, paracone, metacone, and protocone, with the metacone and protocone connected by a crista oblique. There is a recorded hypocone on the third premolar.  In the bottom premolars, the first premolar has one cusp although it can be bicuspid.  The second and third premolar generally have 2-3 cusps, although the second bottom premolar has an entoconid and hypoconid and the third bottom premolar in belzebuth has five cusps with a small hypoconulid.  Upper molars generally have four cusps although the third molar may not have a hypocone (might even have only two cusps).  With the bottom molars, there are generally four cusps and a fifth cusp on the third molar.
caption: Spider monkey in Ecuador.
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