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Margarella violacea : ウィキペディア英語版 | Margarella violacea
''Margarella violacea'' is a species of small sea snail, a marine gastropod mollusk in the family Calliostomatidae, the top snails.〔Bouchet, P. (2010). ''Margarella violacea'' (King & Broderip, 1832) . Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=533033 on 2011-07-04〕 == Description == The size of an adult shell varies between 7 mm and 13.5 mm. The purplish-pink shell is imperforate, orbicular-conical, thin and smooth. There are four swollen whorls.The suture is scarcely impressed. The rounded-quadrangular aperture is angular above, and subangular at the base of slightly thickened and arcuate columella. The umbilico-columellar tract is excavated.〔George Washington Tryon, ''Structural and systematic conchology: an introduction to the study of the Mollusca'', p. 279; 1882〕
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