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Neosabellaria cementarium : ウィキペディア英語版 | Neosabellaria cementarium
''Neosabellaria cementarium'' is a species of marine tube worm in the family Sabellariidae, perhaps better known by its previous name, ''Sabellaria cementarium''. It is found in the North Pacific Ocean. ==Description== ''Neosabellaria cementarium'' lives in a tube which it creates by cementing together grains of sand. This is attached along its length to a rock, shell or other hard substrate. At first it is short but it is widened and extended as the worm grows, sometimes reaching a length of more than and a diameter of . The worm is largely hidden within the tube but it has a yellow or golden-coloured operculum and a number of fine tentacles which it extends in order to feed. Sometimes the tubes are solitary and sometimes they are grouped together but this species does not form reefs.〔 In California, ''Neosabellaria cementarium'' can be confused with the sandcastle worm (''Phragmatopoma californica''). The latter is a reef-building worm and its tentacles and operculum are purple rather than yellow.〔
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