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Granigyra tenera : ウィキペディア英語版 | Granigyra tenera
''Granigyra tenera'' is a species of sea snail, a marine gastropod mollusk, unassigned in the superfamily Seguenzioidea. ==Description== The shell grows to a height of 1.8 mm. The thin shell is narrowly umbilicated. It is semitransparent, lustreless, with nearly microscopic spiral stride, which are wanting on the base and replaced by a rugose or fretted appearance. The color of the shell is pale yellowish white, with a faint greenish tinge. The four whorls are convex. The suture is very deep. The aperture is circular. The thin peristome is slightly expanded.〔(G.W. Tryon (1888), Manual of Conchology X; Academy of Natural Sciences, Philadelphia ) (described as ''Cyclostrema tenera'')〕
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