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''Gibbula tumida'' 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 4 mm and 10 mm. The small, narrowly umbilicate shell has an elevated conical shape. The color is whitish, variously strigate or maculated with brown, beneath white, unicolored or punctate with brown. The spire is elevated, somewhat turrited. The apex is acute. The sutures are impressed. The six whorls are convex, encircled by numerous, close fine striae. The periphery is obtusely angular. The base of the shell is slightly convex, and concentrically finely lirate. The sculpture is coarser than upon the upper surface. The large aperture is rounded-quadrate. The oblique columella is straightened and a little convex in the middle. The deep umbilicus is narrow, expanding and funnel-shaped at its opening. This species is readily recognized by the form, the whorls being a little tumid just below the sutures, and the base of the aperture is usually a little emarginate.〔(Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Gibbula tumida」の詳細全文を読む スポンサード リンク
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