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Astralium confragosum : ウィキペディア英語版 | Astralium confragosum
''Astralium confragosum'' is a species of sea snail, a marine gastropod mollusk in the family Turbinidae, the turban snails.〔Bouchet, P. (2012). ''Astralium confragosum'' (Gould, 1851). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581743 on 2012-09-01〕〔Alf A. & Kreipl K. (2011) The family Turbinidae. Subfamilies Turbininae Rafinesque, 1815 and Prisogasterinae Hickman & McLean, 1990. In: G.T. Poppe & K. Groh (eds), A Conchological Iconography. Hackenheim: Conchbooks. pp. 1-82, pls 104-245.〕 ==Description== The size of the shell varies between 15 mm and 36 mm. Rather low-conic shell is conspicuously radiately plicate above. The folds are somewhat sigmoid and oblique, bearing a series of short rounded knobs above, and terminating in short spines, eighteen to twenty in number, at the carinated periphery. The base of the shell is flat, squamosely lirate. The aperture is tinged with green, especially at the columella. The wrinkled operculum is deep green. 〔 (G.W. Tryon (1888), Manual of Conchology X; Academy of Natural Sciences, Philadelphia ) (described as ''Astralium confragosum'') 〕
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