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Pseudominolia gradata : ウィキペディア英語版 | Pseudominolia gradata
''Pseudominolia gradata'' is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.〔Bouchet, P. (2012). ''Pseudominolia gradata'' (G. B. Sowerby III, 1895). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=701818 on 2012-11-23〕〔Bosch D.T., Dance S.P., Moolenbeek R.G. & Oliver P.G. (1995) Seashells of eastern Arabia. Dubai: Motivate Publishing. 296 pp.〕 ==Description== The size of the shell varies between 3 mm and 8 mm. The turbinate shell is widely and profoundly perforated. It is whjte with radially large, brown spots The apex is acute. The sutures are narrowly channeled. The six whorls are angulated, with the upper whorl is concave to flat. The spire is adorned with oblique striae. and two keels (with narrow lirae between them). The body whorlis biangulate and contains irregular 3 to 4 carinae. The convex base is finely striated and laminated and provided with six rounded lirae. The aperture is slightly oblique and is subquadrate. The peristome is sharp. 〔 (G.B. Sowerby III (1895), New species of sehlls from Kurachi and the Mekran Coast, collected by Mr. F.W. Townsend; Proceedings of the Malacological Society of London. v.1 (1893-1895) ) (described as ''Minolia gradata'' )〕
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