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Ethalia striolata : ウィキペディア英語版 | Ethalia striolata
''Ethalia striolata'' is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.〔WoRMS (2012). ''Ethalia striolata'' (A. Adams, 1855). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=572119 on 2012-11-23〕〔Kilburn, R.N. (1977) Taxonomic studies on the marine Mollusca of southern Africa and Mozambique. Part 1. Annals of the Natal Museum, 23, 173–214.〕 ==Description== The subglobulose, subperforate shell has a discoidal shape and is transversely striate. The five whorls are slightly convex. They are ornamented with very narrow transverse, white articulated lines. The base of the shell is smooth, reddish-brown maculated at the periphery, with a reddish zone around the umbilical region. The callus is white, small, partly concealing the umbilicus. The aperture is oval. 〔 (H. Pilsbry, Manual of Conchology XI, Academy of Natural Sciences, Philadelphia ) 〕
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