额泡 ptilinum，frontal sac
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双翅目环裂类昆虫（如蝇）刚羽化的成虫的囊状器官。是由前额中央部表皮凹陷而成，具有与表皮相同的构造，表面上多小鳞片及小棘。借内压而翻出，羽化时，推开围蛹壳。象家蝇那样在土中化蛹的种类，还可借此器官的伸缩，拨开土粒而到达地面。
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