简述昆虫翅的分区。

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简述昆虫翅的分区。

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参考答案：

（1）翅的形态：昆虫的翅一般为三角形。

（2）翅的3个边缘：翅展开时，靠近头的为前缘，后面靠近身体的为后缘（内缘）在前缘和后缘间，与翅基部相对的为外缘。

（3）翅的3个角：翅基部的角为肩角，前缘与外缘之间的角为顶角，外缘与内缘之间的角为臀角。

（4）翅的分区：由于翅的折叠可将翅划分为臀前区和臀区。有的昆虫在臀区后面还有一个轭区。翅的基部则称为腋区。

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大于0.5而小于0.6的两位小数有______个．

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