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Leptothyra nanina : ウィキペディア英語版 | Leptothyra nanina
''Leptothyra nanina'' is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae.〔Bouchet, P. (2012). ''Leptothyra nanina'' (Souverbie in Souverbie & Montrouzier, 1864). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=573034 on 2013-02-10〕〔Herbert D.G. (1996) A critical review of the trochoidean types in the Muséumd'Histoire naturelle, Bordeaux (Mollusca, Gastropoda). Bulletin du Muséum national d'Histoire naturelle, Paris, ser. 4, 18 (A, 3-4): 409-445.〕 ==Description== The shell reaches a height of 4 mm. The minute, umbilicate shell is suborbicular. The apex is obtuse. The shell is spirally impressed-striate. The apex, the subsutural tract and the base show impressed radiating striae. The color of the shell is white and marked around the periphery with rosy equally spaced spots. There are five, convex whorls. The aperture is rounded. The columella is thickened. The narrow umbilicus is deep, rounded, and radiately plicate on the edge. 〔 (G.W. Tryon (1888), Manual of Conchology X; Academy of Natural Sciences, Philadelphia ) 〕
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