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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昆虫头部内部的内骨骼
次级的，通常不分枝，纵向翅脉，肋脉后
甲脊或龙骨。
蜉蝣类第一个成虫的中间形态
通常有纵向深沟的
浅沟
蚜虫腹部突出的一端。
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