日本ベントス学会誌
Online ISSN : 1883-891X
Print ISSN : 1345-112X
ISSN-L : 1345-112X
南西諸島海域・日本海溝における深海性二枚貝類の外套腔に生息する多毛類(予報)
大越 和加大越 健嗣藤倉 克則藤原 義弘
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2003 年 58 巻 p. 70-76

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Relationships between polychaetes living in the mantle cavity of bivalves and their hosts were examined in a hydrothermal vent and a cold seep in the Ryukyu Islands region, and also cold seeps in the Japan Trench. The polynoid polychaete Branch ipolynoe pettibonae inhabited the mantle cavity of more than 85% of individuals of the mytilid bivalve Bathymodiolus platifrons from the Hatoma Knoll of the former area. One polychaete individual was observed in each bivalve. There was a tendency for the size of the polynoid polychaetes to increase with the size of the host bivalve. The same species was observed to inhabit the mytilid bivalve Bathymodiolus sp. short-type from the Kuroshima Knolls of the Ryukyu Islands region, and this is the first record of this polychate living in a cold seep. The nautiliniellid polychaete Nautiliniella calyptogenicola inhabited the mantle cavity of more than 80% of individuals of the vesicomyid bivalve Calyptogena phaseoliformis from the Japan Trench. One to eight polychaetes were observed to live in one bivalve. There was no relationship between the size of this nautiliniellid polychaete and the size of its host bivalve. More than half of the individuals were incomplete and more than 95% of all individuals had oocytes in the coelom. The thyasirid bivalve Maorithyas hadalis were collected from the Japan Trench, but no worms were found from them.

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