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In some invertebrates (e.g. some Echinodermata and Asteriadina, asteroid starfish), minute, stalked organs, each consisting of a stem with a movable head built of three jaw-like valves and attached to small tubercles on the tests. They are used for grasping, defence, and scavenging. In many species they inject venom.

Subjects: Zoology and Animal Sciences.

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