
thumb|right|200px|Moon jellyfish (Aurelia aurita), with rhopalia visible in indentations of the bell's rim
thumb|right|200px|Moon jellyfish (Aurelia aurita), with rhopalia visible in indentations of the bell's rim
Rhopalia (; ) are small sensory organs of certain Scyphozoan (true jellyfish) and Cubozoan (box jellyfish) species.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).