This is a close-up view of the radioles of a hard tubeworm (Protula bispiralis). These feathery appendages serve both to filter food and for respiration. The polychaete worm's body is encased within the safety of the tube beneath these radioles. This particular worm has borrowed into a colony of Pavona decussata leaf coral to make its home. Photographed in Kagoshima Prefecture, Japan.
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