Piddock (piddock shell) - Piddock (English spelling)

Japanese: ニオガイ(鳰貝) - ニオガイ（英語表記）piddock

A bivalve mollusca of the family Psammidae. The shell is thin and white, measuring 7 cm long, 2.4 cm high, and 2.3 cm wide. It is long and slender from front to back, tapering gradually toward the rear. The apex of the shell is closer to the front, and extends forward like a short beak, with a wide gap between the two shells. A willow-leaf-shaped shell fragment rests on the upper edge. The growth veins on the shell surface are plate-like at the front, and intersect with the radial ribs extending from the apex to form small spines, but gradually become weaker toward the rear. On the inside, a calcareous rod-shaped protrusion protrudes from under the apex of the shell. The soft body is white.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

ニオガイ科の二枚貝。殻は長さ7cm，高さ2.4cm，幅2.3cm，薄質で白色。前後に細長く，後方へゆるやかに細くなる。殻頂は前方に寄り，前方へは短くくちばし状にのび，両殻の間は広く開いている。その上縁に柳葉形の殻片がのっている。殻の表面の成長脈は前方では板状になり，殻頂から出る放射状の肋と交わって小さいとげ状となるが，後ろへいくとしだいに弱くなる。内面は殻頂の下から石灰質の棒状の突起が出る。軟体は白い。

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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