Radix auricularia japonica (English spelling)

Japanese: モノアラガイ(物洗貝) - モノアラガイ（英語表記）Radix auricularia japonica

A freshwater snail shell of the Lymnaea family (illustration). The shell is pale yellowish brown and translucent, reaching a height of 2.5 cm and a diameter of 2 cm. It is ovoid, thin and fragile. The coils are four-tiered but small and conical, with the last coil being much larger than the others. The surface is smooth and shiny except for the growth veins. The shell opening is large and wide, with no lid. The soft body has a large, broad foot, and triangular antennae on the head with small eyes at their base. The mantle is amber-colored with black spots. Because the shell is thin, the soft body shows through and the shell appears black.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

モノアラガイ科の淡水産巻貝（イラスト）。殻は淡黄褐色で半透明，高さ2.5cm，径2cmになる。卵形，薄質でこわれやすい。巻きは4階であるが小さく円錐形で，最後の巻きが他に比べて非常に大きい。表面は成長脈のほかは平滑で光沢がある。殻口も大きく広く，ふたはない。軟体は足が広く大きく，頭には三角形の触角があり，その基部に小さい眼がある。外套膜はあめ色で黒斑がある。殻が薄いので，軟体が透けるため殻が黒っぽく見える。

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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