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Organ formed from the labium, and found only in the nymphs of the insect order Odonata: it is so named because it covers the mouth-parts, and sometimes the face. It is prehensile, and nymphs use it to capture prey by extending it at high speed and impaling the prey on the terminal spikes, or by trapping prey in a basket formed by the mask and its associated bristles.

Subjects: Zoology and Animal Sciences.

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