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Margarites frigidus : ウィキペディア英語版 | Margarites frigidus
''Margarites frigidus'', common name the polar margarite, is a species of sea snail, a marine gastropod mollusk in the family Margaritidae.〔Rosenberg, G. (2012). ''Margarites frigidus''. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=423503 on 2012-09-01〕〔Turgeon, D.D., et al. 1998. Common and scientific names of aquatic invertebrates of the United States and Canada. American Fisheries Society Special Publication 26〕 ==Description== The height of the shell attains 9 mm. The small, conic shell is polished. It has a pale flesh color. It contains six whorls, including a minute subglobular nucleus. The suture is distinct, not appressed. The whorls are only moderately rounded. The axial sculpture consists of faint incremental lines. The spiral sculpture consists of a few very faint lines near the umbilical region. Therounded base is imperforate. The operculum is pale brown with about 8 turns. The rounded aperture is slightly angular above. The outer lip is simple and sharp. The body has a thin nacreous glaze. The columellar lip is rounded, and broader than the rest.〔(Dall (1919) Descriptions of new species of Mollusca from the North Pacific Ocean; Proceeding of the U.S. National Museum, vol. 56 (1920) )〕
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