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Plesiadapiformes cladistically including crown primates [2].

There are — species of living primates, depending on which classification is used. New primate species continue to be discovered: over 25 species were described in the s, and eleven since Primates are divided into two distinct suborders see diagram under History of terminology. The first suborder is called strepsirrhines from Greek 'twisted-nosed or twisted-nostrilled'which contains lemursgalagosand lorisids.

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The colloquial names of species ending in -nosed refer to the rhinarium of the primate. The second suborder is called haplorhineswhich contains "dry-nosed" primates from Greek 'simple-nosed' in the tarsiermonkeyand ape clades.

The last of these groups includes humans. Simians the infraorder called Simiiformes from the Greek word simos, meaning 'flat-nosed' refer to monkeys and apes, which can be classified as Old World monkeys and apes under the infraorder of catarrhines from Greek 'narrow nosed' or as New World monkeys under the infraorder of platyrrhines from Greek 'flat-nosed'. Forty million years ago, simians from Africa migrated to South America by drifting on debris presumablywhich gave rise to the five families continue reading New World monkeys. The remaining simians catarrhines split into apes Hominoidea and Old World monkeys Cercopithecoidea approximately twenty-five million years ago.

Common species that are simians include the Old World baboonsmacaquesgibbonsand great apes ; and the New World capuchinshowlers and squirrel monkeys. Primates have large brains relative to body size compared to other mammals, as well as an increased reliance on visual acuity at the expense https://amazonia.fiocruz.br/scdp/essay/perception-checking-examples/the-cynicism-of-love-by-f-scott.php the sense of smellwhich is the dominant sensory system in most mammals.

These features are more developed in monkeys and apes, and noticeably less so in lorises and lemurs. Some primates are trichromatswith three independent channels for conveying color information.

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Except for apes including humansprimates have tails. Most primates also have opposable thumbs. Many species are sexually dimorphic ; differences may include muscle mass, fat distribution, pelvic width, canine tooth size, hair distribution, oHw coloration. Primates have slower rates of development than other similarly sized mammals, reach maturity later, and have longer lifespans.

Depending on the species, adults may live in solitude, in mated pairs, or in groups of up to hundreds of members.

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Some primates, including gorillashumansand baboons, are primarily terrestrial rather than arborealbut all species have adaptations for climbing trees. Arboreal locomotion techniques used include leaping from tree to tree and swinging between branches of trees brachiation ; terrestrial locomotion techniques include walking on two limbs bipedalism and modified walking on four limbs knuckle-walking. Non-human primates have at least four types of social systemsmany defined by the amount of movement by adolescent females between groups. Most primate species remain at least partly arboreal: the exceptions are humans, some other great apes, and baboons, who left the trees for the ground and now inhabit every continent. Close interactions between humans and non-human primates NHPs can create opportunities for the transmission of zoonotic diseasesespecially virus diseases, including herpesmeaslesebolarabiesand hepatitis.]