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Clanculus atropurpureus
''Clanculus atropurpureus'' is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.〔Bouchet, P. (2012). ''Clanculus atropurpureus'' (Gould, 1849). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=547246 on 2012-11-23〕〔Poppe G.T., Tagaro S.P. & Dekker H. (2006) The Seguenziidae, Chilodontidae, Trochidae, Calliostomatidae and Solariellidae of the Philippine Islands. Visaya Supplement 2: 1-228.〕
Charles Hedley (Proc. Linn. Soc. N.S.Wales, 1902, p. 16) suggests, that ''Clanculus atropurpureus'' and ''Clanculus samoensis'' Hombr. & Jacq., appear to be synonyms of Clanculus denticulatus (Gray, 1827).
==Description==
The height of the shell attains 7 mm, its diameter 9 mm. The depressed,umbilicate shell has conoid shape. It is, dark purplish or ferrugineous brown, unicolored, the apex carmine. The shell contains six convex granose-lirate whorls. The sutures are narrowly subcanaliculate. The body whorl is rounded at the periphery and abruptly briefly deflected anteriorly. It is encircled by 16 or 17 finely, very regularly but feebly granose lirae, which are wider on the base. The aperture is rounded. The outer and basal lips are regularly curved, thickened and finely crenulated within. The columella deeply enters the profound umbilicus, bearing a minute denticle above and at the base. The profound umbilicus is smooth within, bordered and constricted by a marginal rib bearing about four white teeth, the largest near to the parietal wall of the aperture. 〔 (H. Pilsbry, Manual of Conchology XI, Academy of Natural Sciences, Philadelphia ) (described as ''Trochus atropurpureus'')〕
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