Shown here is the rediole array of a Metavermilia inflata polychaete worm. Radioles are the ciliated feather-like tentacles that sessile polychaete worms such as these use for filter-feeding and respiration. The ball is the worm’s operculum, which seals the end of the tube when the animal retracts its radioles. The worm has just defecated, poop visible coming out of the central tube.
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