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Acidopore

The orifice at the tip of the gaster of ants of the subfamily Formicinae and diagnostic for that sub­family. This short nozzle-like structure is generally fringed with a circle of stiff hairs (setae) at its apex. It is used to expel formic acid for defense, the cir­clet of hairs aiding in the rapid evaporation of this substance.

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