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Seguenzia certoma
''Seguenzia certoma'' is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.〔Rosenberg, G. (2013). ''Seguenzia certoma'' Dall, 1919. Retrieved through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=492449 on 2013-06-10〕〔Abbott R. T. (1974). American Seashells. The marine mollusca of the Atlantic and Pacific coast of North America. II edit. Van Nostrand, New York 663 p. + 24 pl:〕
==Description==
(Original description by W.H. Dall) The white, trochiform shell is small, its height attains 5 mm and it is 3.5 mm wide. It has a minute, smooth globular nucleus and seven subsequent strongly sculptured whorls. The suture is obscure. The spiral sculpture consists of a small, closely beaded thread at the summit of the whorl, separated from a low, sharp carina by a wider, excavated interspace, and the latter from a more prominent peripheral carina by a still wider space. On the base of the shell there are three sharp threads followed by three lower rounded threads, which approach the columella. The axial sculpture consists of fine, even, arcuate wrinkles, which, except where they bead the posterior thread, are chiefly visible in the interspaces. The suture is laid on the peripheral thread. Between it and the outer lip at the aperture there is a very deep sulcus. The outer lip is much produced and its edge modified by the external sculpture, so that there is a sulcus at the end of the peripheral keel, another one at the middle of the base, and still another at the base of the columella, which is arcuate and produced like a small plait. The base is imperforate. The body has no visible glaze.〔(Dall (1919) Descriptions of new species of Mollusca from the North Pacific Ocean; Proceeding of the U.S. National Museum, vol. 56 (1920) )〕
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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