Any of numerous usually small arthropod animals of the class Insecta, having an adult stage characterized by three pairs of legs and a body segmented into head, thorax, and abdomen and usually having two pairs of wings.
行业： 动物
北京, 中国
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最大的现存蜻蜓目昆虫物种( 次序包括蜻蜓和蟌)是巨翅豆娘，翅膀周围的尺寸达到19cm一样大(7.5英寸) ，躯体的长度超过12cm(4.7英寸)曾经最大的蜻蜓物种是已经灭绝的巨脉蜻蜓 ...
外形为正方形。
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