Catarrhini is a parvorder of the Primates, one of the three major divisions of the suborder Haplorrhini. It contains the Old World monkeys (superfamily Cercopithecoidea, family Cercopithecidae) and the apes (superfamily Hominoidea).
The latter is further divided into the lesser apes (family Hylobatidae), consisting of the gibbons; and the hominids or great apes (family Hominidae), consisting of the orangutans, gorillas, chimpanzees, and humans. Older references described humans and their most close extinct relatives/ancestors as a family on its own and placed the great apes in the family Pongidae.
Catarrhini means narrow nose, and the term describes their narrow, downward pointing nostrils. Unlike the platyrrhini, they are generally diurnal and their tails (if they have tails at all) are not prehensile. They have flat fingernails.
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