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Xenia is a genus of photosynthetic soft marine coral resembling a mushroom, with "arms" coming out from the top that end in many-fingered "hands". It is unique among corals because of its ability to use its "hands" to "pulse" or push water away from the colony in a constant, grabbing motion. This action is unique to Xenia species, and was once thought to be used for catching ambient plankton, but is now thought to be used for respiration.
My IDs for corals are temptative. If you know better this species please correct me.