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Odostomia galapagensis
''Odostomia galapagensis'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.〔WoRMS (2011). ''Odostomia galapagensis'' Dall & Bartsch, 1909. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575848 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 conic shell is, milk-white. It measures 2.0 mm. The whorls of the protoconch number at least two, forming a depressed helicoid spire, which is slightly tilted to one side and for the greater part immersed in the first of the succeeding turns. The tilted edge of the nucleus shows traces of spiral lirations. The six whorls of the teleoconch are appressed at the summit They are ornamented by two very strong, lamelliform keels, whose edges are decidedly upturned, forming deeply channeled troughs. The posterior of the two lamellae is feebly crenulated. The periphery of the body whorl is marked by a spiral keel which is about half as strong as those between the sutures. A fourth keel, a little weaker than the peripheral one, marks the middle of the base. The deep concave channels between the keels are marked by strong lines of growth. The sutures are strongly channeled. The aperture is irregularly oval. The posterior angle is obtuse. The outer lip is rendered angular by the spiral keels. The columella is stout, curved, reinforced by the base. The parietal wall is covered with a thin callus. 〔 ( 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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