The statocyst consists of a sac-like structure containing a mineralised mass (statolith) and numerous innervated sensory hairs (setae). ... Any movement large enough to throw the organism off balance causes the statolith to brush against tiny bristles which in turn send a message to the brain to correct its balance.

What is the function of Statocysts in arthropods?

Statocysts are paired organs, located at the base of the antennules in decapods or at the base of the uropods in mysids, that enable the crustacean to orient itself with respect to gravity.

What animals do Statocysts work in?

Statocysts are found in representatives of all of the major groups of invertebrates: jellyfish, sandworms, higher crustaceans, some sea cucumbers, free-swimming tunicate larvae, and all the mollusks studied thus far.