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

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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