Neverita (Glossaulax) didyma (English spelling)
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A gastropod shell of the family Nectariniidae (illustration). Also known as Tubetagai. It is found from southern Hokkaido to Kyushu and further into the tropical Pacific Ocean, living on sandy and muddy bottoms from the intertidal zone to depths of about 20 m. The shell is globose-ovoid, reaching a height of 7 cm and a diameter of 8.5 cm. The coils are low conical in five stories, and the last coil is very large and round. The shell surface is smooth and marked with growth veins. The area below the boundary between the coils is dark purple-brown, but the rest is lighter in color, and the base is white. The shell opening is wide and semicircular, the mantle is round, and there is a large brown bulge above the inner lip that leads to an umbilicus. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
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タマガイ科の巻貝（イラスト）。別名ツベタガイ。北海道南部から九州，さらに熱帯太平洋に分布し，潮間帯から水深20mくらいの砂泥底にすむ。殻は球卵形で高さ7cm，径8.5cmに達する。巻きは5階で低い円錐形，最後の巻きは非常に大きく丸い。殻表は平滑で成長脈を刻む。巻きの境の下は濃く紫褐色を帯びるが，他はそれより淡色で，底面は白色。殻口は広く半円形で，外套（がいとう）は丸く，内唇の上方に褐色の大きい臍孔（せいこう）への膨らみがある。
出典 株式会社平凡社世界大百科事典 第２版について 情報 |
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