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Cyclostrema subexcavatum : ウィキペディア英語版 | Cyclostrema subexcavatum
''Cyclostrema subexcavatum'' is a species of sea snail, a marine gastropod mollusk in the family Liotiidae.〔Rosenberg, G. (2012). ''Cyclostrema subexcavatum''. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=532707 on 2012-12-03〕 ==Description== (Original description by G.W. Tryon) The height of the shell attains 2.2 mm. The umbilicus is wide, perspective and shallow. The shell is whitish under a yellowish brown, membraneous epidermis. The spire is scarcely raised. The 4 whorls increase rather slowly until the last, which is rather large. The suture is broadly,angularly impressed. A little below the suture there is a bluntly angulated spiral keel. And on the middle of the base, towards the oblique aperture there is another keel. The thin peristome is simple.〔(G.W. Tryon (1888), Manual of Conchology X; Academy of Natural Sciences, Philadelphia )〕
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