Also found in: Medical, Encyclopedia, Wikipedia.
Related to statocyst: strobila, statolith, ocellus


A small organ of balance in many invertebrates, consisting of a fluid-filled sac containing statoliths that stimulate sensory cells and help indicate position when the animal moves.


(Zoology) an organ of balance in some invertebrates, such as crustaceans, that consists of a sensory vesicle containing small granules. See statolith


(ˈstæt əˌsɪst)

an organ of equilibrium in certain invertebrates, consisting of a fluid-filled sac enclosing sensory hairs and particles of lime or sand.
References in periodicals archive ?
The four lamellate body groups lie on either side of the sagittal plane, in two pairs extending from opposite sides of the central statocyst (Figs.
Removing a whole beak from the buccal mass is much easier than extracting a statolith from the statocyst.
I think of a statocyst as an inside-out tennis ball," explained Dr Mooney.
In the present study, we surgically removed the apical complex, which houses the photoreceptor and the statocyst (a balance organ), from the experimental comb jelly and compared its behavior in altered gravity to that of the control with the apical complex intact.
Then the shaking causes the snails statocyst to release GABA, which binds to the neuron.
Aplysia californica has been shown to have strong control of tissue pH, utilizing carbonic anhydrase and urease to tightly control acid-base balance and thus aragonite deposition in the statocyst (Pedrozo et al.
The antennular statocyst that appears during larval stage VII of the giant river prawn has an array of sensory structures that enable the perception of chemical and tactile stimuli beginning with its early life stages.
Both species use a statocyst to detect changes in gravity (geotaxis) and a photoreceptor to detect changes in light (phototaxis).
Ctenophores, or comb jellies, are geotactic with a statocyst that controls the activity of the eight ciliary comb rows.
Hands-on student activities include manipulation of a model statocyst, the invertebrate equivalent to the human inner ear, and a chair-spinning experiment that demonstrates the disorienting effects of microgravity on the human body.
11A): Peduncle three-segmented, 1st segment with one large ventral spine, one small proximal spine, 40 plumose setae and a statocyst, 2nd segment with 10 plumose setae, 3rd segment with seven plumose setae; outer ramus two-segmented with 2, 6 aesthetascs; inner ramus two-segmented with 1, 3 plumose setae.