Tairagi (Tairagi) - Fan shell

Japanese: タイラギ(玉珧) - タイラギ（英語表記）fan shell

A bivalve mollusks of the family Polytrichum commune (illustration). The product name is Tairagai (flat shell), from which Tairagi is derived. It is a large shell with a shell length of 22 cm, height of 11 cm, and width of 4.5 cm, and some can reach 35 cm in length. The shell is dark yellow-green, somewhat thin, and easily breaks when dry. It is triangular in shape, with the dorsal side straight and narrowing toward the apex, and the posterior end also straight with a narrow opening between the two shells. The shell surface is smooth, but sometimes a row of scaly projections radiate from the apex. This is called Rishiketairagi.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

ハボウキガイ科の二枚貝（イラスト）。商品名はタイラガイ(平貝)で，タイラギもそれから転じた名。殻の長さ22cm，高さ11cm，幅4.5cmになる大型の貝で，長さ35cmに達するものもある。殻は暗黄緑色でやや薄く乾くと壊れやすい。三角形で背側はまっすぐで殻頂のほうへ狭くなり，後端もまっすぐで両殻の間が狭くて開いている。殻の表面は滑らかであるが，うろこ状の突起列が殻頂から放射状に出ることもある。これをリシケタイラギという。

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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