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Odostomia rinella
''Odostomia rinella'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.〔WoRMS (2011). ''Odostomia rinella'' Dall & Bartsch, 1909. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575900 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 cream-colored shell has an elongate-ovate shape. Its length measures 2.3 mm. The whorls of the protoconch number at least two. They form a smooth, depressed helicoid spire, which is obliquely three-fifths immersed in the first of the succeeding turns. The five whorls of the teleoconch are moderately rounded, strongly contracted at the sutures, and somewhat shouldered at the summits. They are marked by strong, tuberculated axial ribs and four spiral cords almost as strong as the ribs between the sutures which renders their junction with the ribs tuberculate. Of the ribs which are slightly protractive, 17 appear upon the first to third and 19 upon the penultimate whorl. The sutures are strongly channeled. The periphery of the body whorl is marked by a sulcus which is crossed by the continuation of the axial ribs. The base of the shell is moderately long, and well rounded. It is marked by six slender spiral threads, the axial sculpture being reduced to mere lines of growth. The aperture is oval. The posterior angle is obtuse. The outer lip is thin. The columella is oblique, almost straight, decidedly revolute. It is marked with a strong fold at its insertion. 〔 (Dall & Bartsch, A Monograph of West American Pyramidellid Mollusks, United States National Museum Bulletin 68, p. 146-147; 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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