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Cirsonella cubitale : ウィキペディア英語版 | Cirsonella cubitale
''Cirsonella cubitale'' is a minute sea snail, a marine gastropod mollusc in the family Skeneidae.〔Marshall, B. (2013). Cirsonella cubitale (Hedley, 1907). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=720339 on 2013-10-03〕 ==Description== The original description by Charles Hedley (1907): The height of the shell attains 1.15 mm, its diameter 0.8 mm. The minute, thin, translucent, and perforate shell has a conical shape. Its colour is white. The spire contains four whorls, the first two are rounded and smooth. Its sculpture shows a dozen prominent, distant, thin radial ribs descending the last two whorls perpendicularly, broadening at the periphery. These there produce a marked angle to the contour of the shell. The spiral threads lattice the interspaces and denticulate the edges of the ribs. The round aperture adheres anteriorly to the body whorl for a short space. The outer lip is formed by the last radial rib. The inner lip is a little expanded and reflected. The umbilicus has a narrow perforation.〔( Charles Hedley, The Mollusca of Mast Head Reef, Capricorn Group, Queensland. Part II; Proceedings of the Linnean Society of New South Wales v. 32 (1907) ) (described as ''Cyclostrema cubitale'')〕
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