A sea pen shares a pit with a shrimp. Sea pens (Pennatulacea) are soft-bodied octocorals that anchor into sediments by inflating the base of a large polyp with water. The side branches of this large polyp hold to or more feeding polyps .

Image ID: expl2428, Voyage To Inner Space - Exploring the Seas With NOAA Collect
Credit: North Atlantic Stepping Stones Science Party, IFE, URI-IAO; NOAA/OAR/OER

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