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Rissoina oryza : ウィキペディア英語版 | Rissoina oryza
''Rissoina oryza'' is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoinidae. ==Description== The height of the small, white shell attains 2 mm. The shell has an oblong-ovate shape. It is solid, smooth, and shining, The spire is moderately elevated, and rather rapidly tapering. The apex is obtuse. The 6-7 whorls are flatly convex. The body whoprl is rather large, and slightly compressed beneath. The suture is faintly impressed and broadly margined beneath. The rather large aperture is oblique and has an sub-ovate shape. The thick peristome is dilated. The columella is oblique.〔(Garrett A. (1873). New species of marine shells inhabiting the South Sea islands. Proceedings of the Academy of Natural Sciences of Philadelphia , 25: 209-231, pl. 2-3 )〕
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