A sea pen shares a pit with a shrimp. Sea pens (Pennatulacea) are soft-bodiedoctocorals that anchor into sediments by inflating the base of a large polypwith water. The side branches of this large polyp hold to or more feeding polyps.
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Credit: North Atlantic Stepping Stones Science Party, IFE, URI-IAO; NOAA/OAR/OER