The Atelidae are one of the four families of New World monkeys now recognised. Formerly they were included in the family Cebidae.
Atelids are general larger monkeys, and the family includes the howler, spider and woolly monkeys. They are found throughout
the forested regions of Central and South America, from Mexico to northern Argentina.
The Callitrichidae (synonym Hapalidae) is one of five families of New World monkeys. The family includes several genera, including
the marmosets, tamarins, and lion tamarins. For a few years, this group of animals was regarded as a subfamily, called the
Callitrichinae, of the Family Cebidae. This taxon was traditionally thought to be a primitive stem lineage, from which all
the larger bodied platyrrhines evolved (see Hershkovitz, 1977).
The Night monkeys, also known as the Owl monkeys or Douroucoulis, are the members of the genus Aotus of New World monkeys
(monotypic in family Aotidae). They are widely distributed in the forests of Central and South America, from Panama south
to Paraguay and northern Argentina. The species that live at higher elevations tend to have thicker fur than the monkeys at
sea level. The genus name means "earless"; they have ears, of course, but the external ears are tiny and hard to see.
The Pitheciidae are one of the four families of New World monkeys now recognised. Formerly they were included in the family
Atelidae. The family includes the titis, saki monkeys and uakaris. Most species are native to the Amazonia region of Brazil,
with some being found from Colombia in the north to Bolivia in the south.
The Cebidae is one of the five families of New World monkeys now recognised. It includes the capuchin monkeys and squirrel
monkeys. These species are found throughout tropical and subtropical South and Central America.
Branisella boliviana is an extinct species of New World monkey from the Salla formation of what is now Bolivia during the
late Oligocene, approximately 26 million years ago. It is the oldest fossil New World Monkey discovered. It was found in Bolivia
by the paleonthologist Leonardo Branisa, and it was named after him by Hoffstetter, the scientist who first described and
classified it in 1969.