At least seven monkey species are native to Central America. An eighth species, the Coiba Island howler is often recognized, but some authorities treat it as a subspecies of the mantled howler,. A ninth species, the black-headed spider monkey is also often recognized, but some authorities regard it as a subspecies of Geoffroy's spider monkey. In addition, two species of white-faced capuchin monkey have been generally recognized since the 2010s although some primatologists consider these to be a single species. Taxonomically, all Central American monkey species are classified as New World monkeys, and they belong to four families. Five species belong to the family Atelidae, which includes the howler monkeys, spider monkeys, woolly monkeys and muriquis. Three species belong to the family Cebidae, the family that includes the capuchin monkeys and squirrel monkeys. One species each belongs to the night monkey family, Aotidae, and the tamarin and marmoset family, Callitrichidae.