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Cyclostrema quadricarinatum
''Cyclostrema quadricarinatum'' is a species of sea snail, a marine gastropod mollusk in the family Liotiidae.〔Bouchet, P. (2012). ''Cyclostrema quadricarinatum'' Melvill & Standen, 1901. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=701866 on 2012-12-03〕〔Bosch D.T., Dance S.P., Moolenbeek R.G. & Oliver P.G. (1995) Seashells of eastern Arabia. Dubai: Motivate Publishing. 296 pp.〕
==Description==
(Original description by Melvill & Standen) The height of the shell attains 1 mm and its diameter 2.25 mm. The solid, depressed shell is umbilicated. The shell is highly sculptured with a minute angle. It contains 3½ whorls with the upper whorl minute. The body whorl is larger in proportion, four-keeled and with acute carinae. With the aid of a lens the surface is seen to be longitudinally extremely shagreened or striate. The peristome is continuous, six-angled externally. The aperture is round. The operculum is present, horny and multispiral. The nearest ally, ''Circulus smithi'' Bush, 1897 (synonym: ''Cyclostrema trlcarinata'' Smith), from West Africa, we have compared with our species. There is some affinity, but, as its name implies, that species is but three-angled and is likewise radiately lirate.
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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