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Commonly referred to a 'Spionid Worms. They live within a non-calcareous burrow, typically lined by sand particles above the sand bed surface. Beneficial worm to have in a reef aquarium, with their presence indicating a healthy reef aquarium.


Spionids are small worms, some living in semi-permanent tubes, and some efficient borers living in coral substrate or in mollusc shells. They have short, fine white tentacle-like food collecting palps visible on the surface of sediments. These are either used for filter feeding or deposit feeding.[1]





  1. (Mather Bennett 1994): Mather, P., Bennett, I., A coral reef handbook, Surrey Beatty and Sons: Chipping Norton, 1994.