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Odostomia cypria : ウィキペディア英語版 | Odostomia cypria
''Odostomia cypria'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.〔Rosenberg, G. (2011). ''Odostomia cypria'' Dall & Bartsch, 1912. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581125 on 2011-10-26〕 〔Turgeon, D.; Quinn, J.F.; Bogan, A.E.; Coan, E.V.; Hochberg, F.G.; Lyons, W.G.; Mikkelsen, P.M.; Neves, R.J.; Roper, C.F.E.; Rosenberg, G.; Roth, B.; Scheltema, A.; Thompson, F.G.; Vecchione, M.; Williams, J.D. (1998). Common and scientific names of aquatic invertebrates from the United States and Canada: mollusks. 2nd ed. American Fisheries Society Special Publication, 26. American Fisheries Society: Bethesda, MD (USA). ISBN 1-888569-01-8. IX, 526 + cd-rom pp.〕 ==Description== The shell is of medium size, measuring 4 mm. The shell is narrowly elongate-ovate, umbilicated, yellowish-white. The nuclear whorls are decollated. The five post-nuclear whorls lie rather high between the sutures. They are moderately rounded, very feebly shouldered at the summit,. They are marked by fine lines of growth and numerous exceedingly fine, closely spaced, spiral striations. The sutures are very slightly constricted. The periphery of the body whorl is very rounded. The base of the shell is moderately long, well rounded and narrowly umbilicated. The aperture is broadly oval, effuse anteriorly. The posterior angle is obtuse;. The outer lip is thin. The inner lip is very oblique, slightly curved and revolute, not appressed to the base. It is provided with a very deep-seated feeble fold at its insertion. The parietal wall is covered with a thick callus, which renders the peritreme complete. 〔 (Paul Bartsch, Proceedings of the U.S. National Museum :42; 1912 ) 〕
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