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Tegula luctuosa : ウィキペディア英語版 | Tegula luctuosa
''Tegula luctuosa'' is a species of sea snail, a marine gastropod mollusk in the family Tegulidae.〔Bouchet, P. (2013). Tegula luctuosa (d'Orbigny, 1841). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=718801 on 2013-12-23〕 ==Description== The height of the shell attains 35 mm, its diameter 44 mm. The solid, heavy shell is depressed, broadly umbilicate, and has a conoidal shape. It is black or purplish. The spire is more or less depressed. The sutures are linear. The shell contains 5 to 6 whorls. The upper ones have a strong carina midway between the sutures. The body whorl is carinated at the periphery and above, generally showing a less prominent carina on the base near the periphery. The aperture is oblique. The arcuate columella is oblique. The umbilicus is broad and deep, with a spiral rib within. This species is characterized by its wide umbilicus and strongly keeled whorls.〔(Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia ) (described as ''Chlorostoma luctuosum'')〕
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