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Turbonilla clarinda : ウィキペディア英語版 | Turbonilla clarinda
''Turbonilla clarinda'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.〔Rosenberg, G. (2011). ''Turbonilla clarinda'' Bartsch, 1912. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581315 on 2012-03-01〕〔Turgeon, D.; Quinn, J.F.; Bogan, A.E.; Coan, E.V.; Hochberg, F.G.; Lyons, W.G.; Mikkelsen, P.M.; Neves, R.J.; Roper, C.F.E.; Rosenberg, G.; Roth, B.; Scheltema, A.; Thompson, F.G.; Vecchione, M.; Williams, J.D. (1998). Common and scientific names of aquatic invertebrates from the United States and Canada: mollusks. 2nd ed. American Fisheries Society Special Publication, 26. American Fisheries Society: Bethesda, MD (USA). ISBN 1-888569-01-8. IX, 526 + cd-rom pp.〕 ==Description== The bluish-white shell is semitranslucent and has an elongate-conic shape. Its length measures 4.7 mm. The 2½ whorls of the protoconch form a rather solute, elevated, helicoid spire. Its axis is at right angles to the succeeding turns, in the first of which it is slightly immersed. The ten whorls of the teleoconch are well rounded and appressed at the summit. They are marked by very regular, rounded, slightly protractive axial ribs, of which 16 occurs on the first to seventh, 18 upon the eight and the penultimate turn. These ribs become slightly flattened and somewhat expanded at the summit. The intercostal spaces are a little wider than the ribs and well impressed. They terminate a little posterior to the suture thus leaving a plain, narrow band immediately above the suture. The sutures are somewhat constricted. The periphery and the base of the body whorl are well rounded and smooth. The aperture is subquadrate. The posterior angle is obtuse. The outer lip is thin, showing the external sculpture within. The slender inner lip is slightlyt sinuous and very slightly revolute. 〔 (P. Bartsch (1912), Additions to the West Ameridan pyramidellid fauna, with descriptions of new species; Proceedings of The United States National Museum 42:261-289 (1912) ) 〕
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