The flight organs of insects. In birds, the word wing or wing is used. There is usually one pair on the middle and one on the metathorax, with the pair on the middle and metathorax called forewings and the pair on the metathorax called hindwings. The underside of the base of the wing is connected to the dorsal plate and the underside to the lateral plate, and the wings vibrate by contracting the wing muscles to fly. The frequency of wing vibration varies depending on the insect species, and the frequency of vibration of the forewings and hindwings is often different. In mosquitoes, the frequency of vibration can be more than 1000 times per second, as can be seen from the pitch of the wing beat. The wings have large and small tubular veins, and the arrangement of these veins varies depending on the insect group, and serves as a basis for classification. In many insects, the surface of the wings is covered with scales and hairs, which form the markings and color unique to the species. In beetles (Coleoptera), the upper wings become leathery and become elytra, in flies (Diptera), the hind wings degenerate into halteres, and in Trichoptera, the forewings degenerate into halteres. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
昆虫類にそなわる飛翔器官。鳥類のものに対しては羽の字,あるいは翼 (つばさ) の語をあてる。普通は中・後胸に各1対あり,中胸のものを前翅,後胸のものを後翅という。翅の基部下面は背板に下面は側板に連結し,翼筋の収縮運動により振動し飛翔する。翅の振動数は昆虫の種によって異なり,前翅と後翅の振動数も異なるものが多い。カなどでは毎秒 1000回以上の振動数になることが,羽音の高さからわかる。翅には大小の管状の翅脈が走り,その配列の様相は昆虫のグループによってさまざまで,分類の基準となる。多くの昆虫では翅の表面は鱗片や毛でおおわれ,これらが種に特有の斑紋や色彩を形成する。また甲虫類 (鞘翅目) では上翅が革質化して鞘翅となり,ハエ類 (双翅目) では後翅が,ネジレバネ (撚翅) 目では前翅が退化して平均棍に変化している。
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