A gastropod shell of the family Polytminae (illustration). The shell is obconical, reaching a height of 5.5 cm and a width of 3.5 cm. It is thick and tough, with seven layers. It looks similar to a cone shell. The shell is covered with a yellowish-brown skin, but removing this it is smooth and has a yellow background with horizontal stripes of blackish-brown spots. This resembles a hedge, hence the name Magakigai. The outer lip of the shell opening thickens in adult shells and is indented below the suture. The inner surface is red, with a black inner lip. The operculum is brown and claw-like, with serrated edges on the outside. When crawling, the operculum uses the operculum as a lever to move with a hopping sound. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
ソデボラ科の巻貝(イラスト)。殻は倒円錐形で,高さ5.5cm,幅3.5cmに達する。殻は厚く堅固。巻きは7層。外観はイモガイ類に似ている。殻表は黄褐色の殻皮をかむるが,それを除くと平滑で黄色の地に黒褐色の斑が横縞状にならぶ。これを生垣に見たててマガキガイの名がある。殻口の外唇は成貝では厚くなり,縫合下で湾入する。内面は紅色で,内唇部は黒色になっている。ふたは褐色のつめ状で外側が鋸歯状に刻まれる。はうときには,このふたをてこにして,ごとりごとりと跳ねるように移動する。
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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