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Plagiostropha opalus : ウィキペディア英語版 | Plagiostropha opalus
''Plagiostropha opalus'' is a species of sea snail, a marine gastropod mollusk in the family Drilliidae. ==Description== The size of an adult shell varies between 9 mm and 20 mm. The shell has continuous longitudinal distant ribs. The wide interstices are smooth or with revolving striae. The whorls are obtusely angulated in the middle. The shell is white with the interstices of the ribs sometimes more or less stained with brown.〔G.W. Tryon, Manual of Conchology vol. VI p. 253; 1884 (described as ''Mangilia opalus'')〕
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