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In certain aquatic invertebrates, a vesicle containing mineral grains that stimulate sensory cells as they move in response to the movement of the animal. The statocyst is primarily a gravity receptor, acting as an organ of equilibrium that allows a swimming organism to maintain a horizontal attitude. One or more mineral grains (statoliths), often of calcium carbonate, rest in sensory hairs; any displacement relative to gravity causes the statolith(s) to stimulate the sensory hairs which send information to the nervous system.

Subjects: Zoology and Animal Sciences.

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