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Ondina obliqua
''Ondina obliqua'' is a rare species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.〔Gofas, S. (2011). ''Ondina obliqua'' (Alder, 1844). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=141036 on 2012-01-12〕〔Gofas, S.; Le Renard, J.; Bouchet, P. (2001). Mollusca, in: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50: pp. 180-213〕
==Description==
The shell reaches a length of 2.5 mm to 5 mm. The very thin, whitish shell has a transparent, glossy appearance. It has a typical intorted protoconch. The teleoconch contains five whorls, marked with fine, close spiral striae, becoming coarser on the base. The suture is deep and oblique. The outer lip is flexuous, retreating, sinuated above. It is smooth within. The columellar tooth shows only a slight obscure fold. There is no umbilicus or a very small umbilical chink. 〔 (G.W. Tryon, Manual of Conchology vol. VIII, p. 350; 1886 ) 〕
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