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Odostomia photis
''Odostomia photis'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.〔WoRMS (2011). ''Odostomia photis'' Carpenter, 1856. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575889 on 2011-11-10〕 〔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 white, small shell has a pupiform shape. The whorls of the protoconch number at least two. They form a depressed helicoid spire, whose axis is at right angles to that of the succeeding turns, in the first of which it is about one-half immersed. The five whorls of the teleoconch are well rounded, moderately contracted at the suture, slightly shouldered at the summit. They are marked by strongly raised, narrow, somewhat retractive axial ribs, of which 12 occur upon the first, 14 upon the second, and about 20 upon the penultimate turn. In addition to the axial ribs the whorls are marked between the sutures by five strong, narrow, spiral keels which render the intersections of the ribs cuspidate. The sutures are well impressed. The periphery and the base of the body whorl are well rounded. They are marked by the strong continuations of the axial ribs and five spiral keels, similar to those between the sutures. The aperture is pear-shaped. The outer lip is thin, showing the external sculpture within. The columella is strongly curved and revolute. It is provided with a weak fold at its insertion. The parietal wall is covered with a thin callus. 〔 (Dall & Bartsch, A Monograph of West American Pyramidellid Mollusks, United States National Museum Bulletin 68, p. 171-172; 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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