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Ceriantharians have a crown of tentacles that are composed of two whorls of distinctly different sized tentacles. The outer whorl consists of large tentacles that extend outwards. These tentacles taper to points and are mostly used in food capture and defence. The smaller inner tentacles are held more erect than the larger lateral tentacles and are used for food manipulation and ingestion. A few species such as Anactinia pelagica are pelagic and are not attached to the bottom instead, they have a gas chamber within the pedal disc, allowing them to float upside down near the surface of the water.
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