UIS Commission on Karst Hydrogeology and Speleogenesis
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Glossary of Karst and Cave Terms

(plural cupulae). A jellylike rod projecting into the water from a neuromast, part of a fish's or amphibian's lateral line system. Vibrations in the water cause the cupula to move, thus setting off nervous impulses that enable the animal to detect nearby movements in the water [23]. [Not to be confused with cupola.]