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Gibbula drepanensis : ウィキペディア英語版 | Gibbula drepanensis
''Gibbula drepanensis'' is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails. ==Description== The size of the shell varies between 2 mm and 5 mm. The small shell is narrowly umbilicate, depressed, and stomatella-shaped. It is whitish, zigzagly striped with red, the stripes often broken into spots, white around the umbilicus. The spire is very short. The sutures are impressed. The 3 to 4 whorls are convex and rapidly widening. They are encircled by spiral striae which are nearly obliterated on the body whorl. This body whorl is very large and depressed . The large aperture is oblique and subcircular. The columella is arcuate. 〔 (Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia ) 〕
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