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DescriptionAn occasionally gregarious segmented worm that builds tubes from sand or shell fragments. Found subtidally in exposed areas. Does not form reefs over most of its range being found mostly individually but may form thin crusts or large reefs up to several metres across and 60 cm high. Quite similar to Sabellaria alveolata.At low densities, the tubes are attached to the substratum along the entire length but at greater densities competition for space results in the tubes overlapping and may cause the tubes to be built outwards, away from the substratum.