obelia definition

  • noun:
    • Any of various colonial marine hydroids associated with the genus Obelia, having numerous specific eating and reproductive polyps and growing in a branchlike type. Colonies of obelia are found as a delicate furlike development in the wood piles of piers and wharves.
    • some of numerous colonial marine hydroids for the genus Obelia.
    • A genus of campanularian polyps, distinguished from Campanularia by the flat discoidal medusæ with many marginal tentacles and eight interradial vesicles.

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