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Odostomia callipyrga
''Odostomia callipyrga'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.〔WoRMS (2011). ''Odostomia callipyrga'' Dall & Bartsch, 1904. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575824 on 2011-10-26〕〔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, oblong-ovate shell is somewhat ventricose. Its length measures 2.2 mm. The whorls of the protoconch are nearly half immersed in the first of the succeeding turns. The four whorls of the teleoconch are somewhat inflated, moderately contracted at the periphery and moderately shouldered at the summit. They are marked by strong spiral cords of which 2 appear upon the first, 3 upon the second, and 4 upon the penultimate turn between the sutures. These cords are separated by well impressed, narrow, spiral grooves which are crossed by slender axial threads. The periphery and the base of the body whorl are well rounded, marked by four spiral cords, similar to those on the spire, the space between which is ornamented like the grooves in the spire. The aperture is oval. The posterior angle is acute. The outer lip is thin, showing the external sculpture within. The columella is slender, somewhat curved and slightly reflected, provided with a 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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