Simian

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Cebidae

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Aotidae

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Pitheciidae

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Atelidae

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Cercopithecidae

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Hylobatidae

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Hominidae

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The simians (infraorder Simiiformes) are the "higher primates" very common to most people: the monkeys and the apes, including humans. Simians tend to be larger than the "lower primates" or prosimians.

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The simians are split into three groups. The first division is literally as wide as the Atlantic Ocean. The New World monkeys in clade Platyrrhini split from the simian line about 40 million years ago (mya), leaving clade Catarrhini occupying the Old World. This group split about 25 mya between the Old World monkeys and the apes. Earlier classifications split the primates into two large groups: the "Prosimii" (strepsirrhines and tarsiers) and the "Anthropoidea" (simians).

Infraorder: REDIRECT Order (biology)...

Primate: :For the ecclesiastical use of this term, see primate (religion)...

Monkey: A monkey is any member of two of the three groupings of simian primates. These two groupings are the New World and Old World monkeys of which together there are nearly 200 species. Because of their similarity to monkeys, apes such as chimpanzees and gibbons are sometimes incorrectly called monkeys. ...