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Odostomia cassandra
''Odostomia cassandra'' is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.〔Rosenberg, G. (2011). ''Odostomia cassandra'' Bartsch, 1912. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581115 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 small shell measures 2.5 mm. It is, ovate, very thin, semitransparent, light yellow. The nuclear whorls are deeply immersed in the first of the succeeding turns. The four post-nuclear whorls are very strongly, tabulatedly shouldered at the summit, moderately rounded. They are marked by fine incremental Iines, and numerous exceedingly closely spaced, very fine, spiral striations. The sutures are strongly constricted. The periphery of the body whorl is well-rounded. The base of the shell is rather long, well-rounded. The aperture is very large and broadly oval. The posterior angle is decidedly obtuse. The outer lip is very thin. The inner lip is very slender, very oblique, somewhat sinuous, strongly curved, and slightly reflected over the base, but not appressed to it. It is provided with a weak fold some little distance anterior to its insertion. 〔 (Paul Bartsch, Proceedings of the U.S. National Museum :42; 1912 ) 〕
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