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Tegula atra
''Tegula atra'' is a species of sea snail, a marine gastropod mollusk in the family Tegulidae.〔Rosenberg, G. (2012). ''Tegula atra'' (Lesson, 1830). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=533469 on 2012-09-01〕
==Description==
The size of the shell varies between 24 mm and 62 mm. The heavy, solid, imperforate shell has a conical shape and is more or less depressed. It is lusterless black. The about six whorls are, moderately convex, separated by impressed sutures. They are smooth, except for slight incremental striae. The body whorl is more or less depressed, and rounded or subangular at the periphery. The base of the shell is flattened, concave in the center, eroded and light purplish in front of the aperture. The aperture is very oblique. The outer lip is black-margined, smooth and pearly within. The columella is oblique, obtusely dentate in the middle. The umbilico-columellar tract is covered by a white callus, excavated at the position of the umbilicus, and bearing a spiral rib.〔(Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia ) (described as ''Chlorostoma atra'')〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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