see rhopalium.

Online Dictionary of Invertebrate Zoology. . 2005.

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  • rhopalium — n.; pl. lia [Gr. rhopalon, club] (CNIDARIA) A hollow tentacle or sense organ with endodermal statoliths and rarely ocelli, that lay in each notch between the lappets at the end of a pedalium; lithostyle; statorhabd; tentaculocyst; statocyst;… …   Dictionary of invertebrate zoology

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