Walnut shell (Ennucula niponica)

Japanese: クルミガイ(胡桃貝) - クルミガイ（英語表記）Ennucula niponica

A species of the Nuculidae family that has primitive characteristics among bivalves (illustration). It inhabits sandy and muddy bottoms at depths of 30 to 1,600 meters from the Boso Peninsula to Kyushu. Its shell is small, 2.3 cm long, 1.6 cm high, and 1 cm bulged, like a clam, but unlike clams, the apex of the shell is at the rear, and the longer edge is at the front. The surface of the shell is covered with a yellow-green skin, and the growth veins are weak. The inside has a strong pearly luster, and there is a spoon-shaped protrusion under the apex of the shell, with a row of small teeth in front and behind it.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

二枚貝の中で原始的な性質をもっているクルミガイ科の1種（イラスト）。房総半島から九州の水深30～1600mくらいの砂泥底にすむ。殻は小さく，長さ2.3cm，高さ1.6cm，膨らみ1cmくらいになるハマグリ型であるが，ハマグリとは逆に殻頂が後方によって，縁の長いほうが前である。殻表は黄緑色の皮をかむり，成長脈は弱い。内面は強い真珠光沢があって，殻頂の下にスプーン形の突起があり，その前後に小さい歯が並んでいる。

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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