metapleural gland
(ARTHROPODA: Insecta)
In most Formicidae, a gland with an external bulla and a small orifice, opening on each side of the metathorax at its lower posterior corners; thought to function as a protection against microorganisms in the nest chamber due to fungistatic and bacteriostatic activity.

Online Dictionary of Invertebrate Zoology. . 2005.

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