Tsukihigai (Tsukihigai) - Tsukihigai (English spelling) saucer scallop

Japanese: ツキヒガイ(月日貝) - ツキヒガイ(英語表記)saucer scallop
Tsukihigai (Tsukihigai) - Tsukihigai (English spelling) saucer scallop
A bivalve mollusks of the Pectinidae family (illustration). The terms "sun and moon shell" are used, although they are Japanese-English terms. The shell is circular, with only slight bulges, and is smooth and shiny. The right shell is pale yellow-white and the left shell is red, which resembles the moon and the sun, hence the name. There are small ear-like projections on both sides of the apex of the shell, and the upper edge is straight. The inside is white with a yellow periphery. There are 45 to 52 paired thin ribs radiating out. The soft body is yellowish, and the edge of the mantle membrane has many reddish-brown thread-like tentacles, between which are the mantle eyes.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
イタヤガイ科の二枚貝(イラスト)。sun and moon shellは和製英語であるが使われる。殻の長さ,高さとも11cm,幅2cmに達する。円形で膨らみは弱く,平滑で光沢がある。右殻は淡黄白色,左殻は赤色で,これを月と太陽に見たててこの名がある。殻頂の両側に小さい耳状突起があり,上縁はまっすぐ。内面は白色で周囲は黄色。45~52本の対になった細い肋が放射状に出る。軟体は黄みを帯び,外套(がいとう)膜の縁には多くの赤褐色の糸状触手があり,その間に外套眼がある。

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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