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Odostomia poppei
''Odostomia poppei'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.〔WoRMS (2011). ''Odostomia poppei'' Dall & Bartsch, 1909. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575890 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〕
The epithet "poppei" refers to Professor Ewald Poppe.
==Description==
The milk-white shell has an elongate-ovate shape. The length measures 2.2 mm. The whorls of the protoconch are small, completely obliquely immersed in the first post-nuclear turn above which the tilted edge of the last volution only projects. The five whorls of the teleoconch are slightly rounded, strongly tabulatedly shouldered at the summit, and decidedly sulcate at the periphery. They are marked by strong, well-rounded, curved, somewhat retractive axial ribs, of which 22 occur upon the second, 26 upon the third, and 30 upon the penultimate turn; on the first they are obsolete. The intercostal spaces are well impressed, about as wide as the ribs. The posterior edge of the peripheral sulcus coincides with the summits of the whorls, which render the sutures profoundly channeled. The sulcus is bordered on each side by a well-rounded, slender, spiral cord, which
forms low tubercles at the junction with the ribs. The peripheral sulcus is crossed by the undiminished axial ribs, which break it up into a series of deep pits. The base of the body whorl is somewhat attenuated, with a shallow pit at the umbilical region. It is marked by the continuations of the axial ribs, which here have a decidedly retractive slant, and about twelve slender, spiral lirations. The aperture is oval. The posterior angle is obtuse. The outer lip is thin, showing the external sculpture within. The columella is stout, curved, reinforced by the base. It is provided with a well-developed fold at the insertion of the columella. The parietal wall is covered by a thin callus. 〔 (Dall & Bartsch, A Monograph of West American Pyramidellid Mollusks, United States National Museum Bulletin 68, p. 170-171; 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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