ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY
Lesser cylinder anemone (Cerianthus lloydi). Cylinder, or tube, anemones are anthozoans that look very similar to sea anemones, but belong to a different subclass. They inhabit soft sediments in tubes made of secreted mucuos, which they live in and can withdraw into.
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