statolith

noun

1. Synonym of otolith.
2. A specialized form of amyloplast involved in graviperception by plant roots and most invertebrates.

   “The statolith is either acquired from the animal's surroundings or secreted by the epithelial cells of the statocyst.”

   “When the squid (or other cephalopod) accelerates, the statolith is pressed back in its “seat” like a person in a car.”