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OsmeteriumA Y-shaped gland located behind the head of some caterpillars which can be pushed out to emit a chemical disagreeable to potential predators.
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Osmeteriumscent-producing area behind the tibia
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Osmeterium(plural: osmeteria) defensive organ in the first thoracic segmen of larvae of Papilionid butterflies (e.g. swallowtail) foul-smelling substances, usually forked and everted typically from behind the head.
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