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| image = Cute Monkey cropped.jpg | image_caption = Macaque monkey ''Bonnet macaque'' | regnum = Animalia | phylum = Chordata | classis = Mammalia | ordo = Primates | subordo = Haplorhini | infraordo = Simiiformes | infraordo_authority = Haeckel, 1866 |includes = :Callitrichidae :Cebidae :Aotidae :Pitheciidae :Atelidae :Cercopithecidae :†Parapithecidae |excludes= :Hylobatidae :Hominidae }} Monkeys are haplorhine ("dry-nosed") primates, a paraphyletic group generally possessing tails and consisting of approximately 260 known living species. Many monkey species are tree-dwelling (arboreal), although there are species that live primarily on the ground, such as baboons. Most species are also active during the day (diurnal). Monkeys are generally considered to be intelligent, particularly Old World monkeys. Lemurs, lorises, and galagos are not monkeys; instead they are strepsirrhine ("wet-nosed") primates. Like monkeys, tarsiers are haplorhine primates; however, they are also not monkeys. There are two major types of monkey: New World monkeys (platyrrhines) from South and Central America and Old World monkeys (catarrhines of the superfamily Cercopithecoidea) from Africa and Asia. Hominoid apes (gibbons, orangutans, gorillas, chimpanzees, and humans), which all lack tails, are also catarrhines but are not considered monkeys. (Tailless monkeys may be called "apes", incorrectly according to modern usage; thus the tailless Barbary macaque is sometimes called the "Barbary ape".) Because old world monkeys are more closely related to hominoid apes than to new world monkeys, yet the term "monkey" excludes these closer relatives, monkeys are referred to as a paraphyletic group. Simians ("monkeys") and tarsiers emerged within haplorrhines some 60 million years ago. New world monkeys and catarrhine monkeys emerged within the simians some 35 millions years ago. Old world monkeys and Hominoidea emerged within the catarrhine monkeys some 25 millions years ago. Extinct basal simians such as Aegyptopithecus or Parapithecus (Million years ago ) are also considered monkeys by primatologists. ==Historical and modern terminology== The origin of the word is unclear, however, it is likely derived from Sanskrit word "markata", which denominates non-primate apes. In most Germanic languages monkeys are called "meercat" in accordance to that. (In English the meaning of meercat has changed to denominate a different animal.) According to the Online Etymology Dictionary, the word "monkey" may originate in a German version of the ''Reynard the Fox'' fable, published circa 1580. In this version of the fable, a character named Moneke is the son of Martin the Ape. In English, no very clear distinction was originally made between "ape" and "monkey"; thus the 1910 Encyclopædia Britannica entry for "ape" notes that it is either a synonym for "monkey" or is used to mean a tailless humanlike primate. Colloquially, the terms "monkey" and "ape" are widely used interchangeably.〔http://www.merriam-webster.com/dictionary/monkey〕 Also, a few monkey species have the word "ape" in their common name, such as the Barbary ape. Later in the first half of the 20th century, the idea developed that there were trends in primate evolution and that the living members of the order could be arranged in a series, leading through "monkeys" and "apes" to humans. Monkeys thus constituted a "grade" on the path to humans and were distinguished from "apes". Scientific classifications are now more often based on monophyletic groups, that is groups consisting of ''all'' the descendants of a common ancestor. The New World monkeys and the Old World monkeys are each monophyletic groups, but their combination is not, since it excludes hominoids (apes and humans). Thus the term "monkey" no longer refers to a recognized scientific taxon. The smallest accepted taxon which contains all the monkeys is the infraorder Simiiformes, or simians. However this also contains the hominoids (apes and humans), so that monkeys are, in terms of currently recognized taxa, non-hominoid simians. Colloquially and pop-culturally, the term is ambiguous and sometimes monkey includes non-human hominoids.〔http://www.ew.com/ew/gallery/0,,20483133_20488693_20945431,00.html#20945426〕 A group of monkeys may be commonly referred to as a tribe or a troop. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Monkey」の詳細全文を読む スポンサード リンク
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