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''Pyramidella auricoma'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.〔WoRMS (2011). ''Pyramidella auricoma'' Dall, 1889. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575935 on 2012-01-12〕〔Keen M. (1971). Sea shells of Tropical West America. Marine mollusks from Baja California to Perú. (2nd edit.). Stanford University Press pp. 1064〕 ==Description== The shell has a regularly elongate-conic shape. It is yellowish-white, with fine golden yellow spiral lines between the sutures and on the base. Its length measures 10.6 mm. The whorls of the protoconch are small, deeply obliquely immersed in the first succeeding turn. The ten whorls of the teleoconch are well rounded, feebly shouldered at the summit, scarcely at all contracted at the sutures. The sutures are weakly impressed. The periphery and the base of the body whorl are well rounded and smooth. The aperture is irregularly oval. The outer lip is thin. It is reinforced deeply within by five strong spiral cords, one of which is at the periphery, two divide the space between this and the summit into three equal parts, and two a little less strong are on the base. The columella is strong and straight. The posterior fold is oblique, very strong and lamellar. The anterior two are about one-fourth as high as the posterior, very oblique. The parietal wall is glazed by a thin callus. 〔(Dall & Bartsch, A Monograph of West American Pyramidellid Mollusks, United States National Museum Bulletin 68, p. 19: 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「Pyramidella auricoma」の詳細全文を読む スポンサード リンク
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