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Odostomia altina
''Odostomia altina'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.〔Rosenberg, G. (2011). ''Odostomia altina'' Dall & Bartsch, 1909. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581092 on 2011-10-26〕 〔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 ovate shell is white. Its length measures 3 mm. The whorls of the protoconch are deeply obliquely immersed in the first of the succeeding turns, above which only the tilted edge of the last volution projects. The five whorls of the teleoconch are well rounded, feebly contracted at the suture and appressed at the summit. The suture is slightly impressed. The periphery is obscurely angulated. The base of the shell is well rounded. The entire surface is marked by slightly retractive lines of growth and exceedingly fine spiral striations. The aperture is ovate. The posterior angle is acute. The outer lip is thin. The columella is strongly curved, decidedly revolute and provided with a strong fold at its insertion. 〔 ( William Healy Dall and Paul Bartsch , "A Monograph of West American Pyramidellid Mollusks" , Smithsonian Institution, 1909 ) 〕
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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