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Odostomia pulchra
''Odostomia pulchra'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.〔WoRMS (2011). ''Odostomia pulchra'' (De Folin, 1872). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575894 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 shell is ovate, conic, subvitreous, and shining. It measures 2.2 mm. The 1½ whorls of the protoconch are obliquely immersed in the first of the succeeding turns. The 4½ whorls of the teleoconch are well rounded. They are marked by four spiral cords between the sutures and equally strong axial ribs, of which 14 occur upon the second, 16 upon the third, and 18 upon the penultimate turn. The sutures are well impressed. The periphery of the body whorl is marked by a slender channel. The base of the shell is well rounded. It is marked by four
subequal, broad, rounded keels, the spaces between which are marked by slender riblets. The aperture is almost pear-shaped. The posterior angle is obtuse. The outer lip thin, showing the external sculpture within. The columella is slender, strongly curved, decidedly reflected, and provided with a weak fold at its insertion. 〔 (Dall & Bartsch, A Monograph of West American Pyramidellid Mollusks, United States National Museum Bulletin 68, p. 158-159; 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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