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''Odostomia baranoffensis'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.〔WoRMS (2011). ''Odostomia baranoffensis'' Dall & Bartsch, 1909. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=576637 on 2011-10-26〕〔Kantor Yu.I. & Sysoev A.V. (2006) Marine and brackish water Gastropoda of Russia and adjacent countries: an illustrated catalogue. Moscow: KMK Scientific Press. 372 pp. + 140 pls.〕 This species is considered a synonym of ''Odostomia tenuisculpta'' Carpenter, 1864 by ITIS.〔(ITIS: Odostomia tenuisculpta )〕 Dall & Bartsch made the distinction based upon the following indications:〔 * ''Odostomia tenuisculpta'' : incised spiral lines are strong on the early whorls and much finer on the later turns. * ''Odostomia baranoffensis'' : incised spiral lines are exceedingly fine; periphery of the whorls well rounded; summit of the whorls tabulated. ==Description== The elongate-ovate, yellowish-white shell is rather stout. Its length measures 6.3 mm. The whorls of the protoconch are obliquely immersed in the first of the succeeding turns, the outer edge of the last turn only being visible. The six whorls of the teleoconch are well rounded, with a narrow, tabulate shoulder at the summit. The suture is rendered subchanneled by the shoulder at the summit of the whorls. The periphery and the base of the body whorl is inflated, well rounded, the latter with a depressed pit, but no perforation in the umbilical area. The entire surface is marked by lines of growth and very fine spiral striations. The aperture is ear-shaped. The posterior angle is obtuse. The outer lip is thick within and thin at the edge. The columella is very stout, twisted and obliquely revolute, armed with a thick oblique fold opposite the umbilical chink;. The parietal wall is covered by a thin callus.〔( 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）』 ■ウィキペディアで「Odostomia baranoffensis」の詳細全文を読む スポンサード リンク
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