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Clanculus ringens
''Clanculus ringens'', common name the ringent clanculus, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.〔Rosenberg, G. (2012). ''Clanculus ringens'' (Menke, 1843). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=594208 on 2012-11-23〕
==Description==
The size of the shell varies between 8 mm and 13 mm. The perforate shell has a conical shape and contains 7 whorls. The first whorl is smooth, yellowish; the following whorls are planulate, separated by canalicidate sutures. They are maculate with chestnut and white. They are spirally cingulate above with 4 elegantly granulate ridges, the upper and lower the larger. The body whorl is acutely carinated. The base of the shell is slightly convex, ornamented with 8 to 9 granose cinguli . The oblique aperture is rhomboidal and narrow. The basal margin is sulcate-denticulate. The oblique columella is strong and terminates below in a large tooth, ringent above. The columella is callous, ringent, and plicate. 〔 (H. Pilsbry, Manual of Conchology XI, Academy of Natural Sciences, Philadelphia ) (described as ''Trochus ringens'')〕
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