Sea pen

Order of colonial marine cnidarians

Sea pens are marine cnidarians belonging to the superfamily Pennatuloidea. They are fleshy colonial organisms anchored to the seabed, with tiny polyps embedded in a soft matrix. They have a cosmopolitan distribution, being found in tropical and temperate waters worldwide, from intertidal shallow waters to deep seas of more than 6,100 m (20,000 ft).

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