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・ Odostomia franki
・ Odostomia fuijitanii
・ Odostomia funiculustriata
・ Odostomia fusulus
・ Odostomia gabrielensis
・ Odostomia galapagensis
・ Odostomia gallegosiana
・ Odostomia gemma
・ Odostomia geoffreyi
・ Odostomia gittenbergeri
・ Odostomia glaphyra
・ Odostomia gloriosa
・ Odostomia gouldii
・ Odostomia gracilientis
・ Odostomia gradusuturae
Odostomia grammatospira
・ Odostomia granadensis
・ Odostomia gravida
・ Odostomia grijalvae
・ Odostomia grippiana
・ Odostomia guatulcoensis
・ Odostomia gulicki
・ Odostomia hagemeisteri
・ Odostomia harfordensis
・ Odostomia harveyi
・ Odostomia haurakiensis
・ Odostomia heathi
・ Odostomia helena
・ Odostomia helga
・ Odostomia hemphilli


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Odostomia grammatospira : ウィキペディア英語版
Odostomia grammatospira

''Odostomia grammatospira'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.〔WoRMS (2011). ''Odostomia grammatospira'' Dall & Bartsch, 1903. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575851 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 elongate-conic shell is semitranslucent and measures 5.8 mm. The whorls of the protoconch are small, forming a depressed helicoid spire, which is a little more than half obliquely immersed in the first of the succeeding turns. The eight whorls of the teleoconch are moderately rounded, marked by four strong, equal, and almost equally spaced spiral cords which are separated by three well-incised spiral grooves. The suture is subchanneled. The periphery of the body whorl is marked by a depressed cord which is not quite as strong as those between the sutures. The base of the shell is somewhat attenuated, well rounded. It is marked by ten spiral cords which grow successively weaker and closer spaced from the periphery toward the umbilical area, disappearing altogether on the extreme anterior portion. The spaces between the spiral cords on the spire and the base are marked by slender axial threads. The aperture is oval, effuse anteriorly. The posterior angle is acute. The outer lip is thin, showing the external sculpture within, rendered wavy by the keels. The columella is stout, reflected, reinforced by the base, and provided with a weak fold at its insertion. The parietal wall is glazed with a faint callus. 〔 ( William Healy Dall and Paul Bartsch , "A Monograph of West American Pyramidellid Mollusks" , Smithsonian Institution, 1909 ) 〕

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