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A sand grain or other solid inclusion which moves readily in the fluid contents of a statocyst, comes to rest on the lower surface of the cell, and is believed to function in gravity perception.
(invertebrate zoology)
A secreted calcareous body, a sand grain, or other solid inclusion contained in a statocyst.



(1) A synonym for otolith.

(2) In plants, a small mobile starch grain found in cells of the rootcap, tips of cereal coleoptiles, and other growing parts. When the direction of the axis of the organ changes, the statoliths drop and exert pressure on the cytoplasm, resulting in geotropic bending of the organ. Statoliths are consumed by the plant during severe starvation, for example, when there is prolonged darkness. The cells that contain statoliths are called statocysts.

References in periodicals archive ?
5-1 mm along the oral-aboral axis, lacked bristles by DIC microscopy, yet possessed a dome and four balancers supporting a small statolith.
In some atypical beak samples, we found "check" rings, which were similar to the rings in the microstructure of the statolith (Fig.
The single large statolith consists of numerous aggregated living cells, or lithocytes.
Both the funnel organ and statolith of this species are described based in McGowan & Okutani (1968), Clarke (1978), and Lipinski et al.
7 mm/day in the 18-48 cm ML range (Araya, 1983), and good agreement exists between growth rates obtained from tag-recapture studies and those from statolith aging studies (Yatsu et al.
A common feature is a fluid-filled cavity that contains a mass (a single statolith or numerous statoconia) of higher specific weight than the surrounding fluid that can load and mechanically stimulate underlying sensory elements, resulting in behavioral responses to gravity (Horridge, 1969, 1971; Budelmann, 1988).
maturation patterns, trophic relationships, the occurrence of certain parasites, statolith morphometrics), however, suggests that these squid are in fact BNS members that migrate north to spawn in Brazilian waters (Santos & Haimovici, 1997; Schwarz & Perez, 2007).
Statolith age estimates of the loliginid squid Loligo opalescens (Mollusca: Cephalopoda): corroboration with culture data.
Since changing the density of the external medium has no effect on the sedimentation of intracellular particles, these results are inconsistent with the statolith model but predicted by, and consistent with, the gravitational pressure hypothesis for plant gravisensing.
Based on statolith studies, its life span is generally assumed to be 1 y, and only the largest animals are thought to attain an age of 2 y (Nigmatullin et al.