A bivalve mollusk of the Pectinidae family (illustration). A large species with an open fan shape, reaching 12.5 cm in length, 13 cm in height, and 3.5 cm in width. The surface of the shell has 24 ridges radiating from the apex, with a row of scale-like protrusions on top. Its shape resembles a Japanese fan, hence the name. The apex of the shell is straight with triangular protrusions on both the front and back, with the anterior one being larger. The right shell has a recess through which the byssus extends. The color and pattern of the shell vary from individual to individual and are not consistent, but most are brownish, and there are cloud-like markings near the apex of the shell. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
イタヤガイ科の二枚貝(イラスト)。開いた扇形で長さ12.5cm,高さ13cm,幅3.5cmに達する大型種。表面には殻頂から放射状にうねが24本内外出ていて,その上にうろこ状の突起が並んでいる。その形が檜扇に似ているのでこの名がある。殻頂はまっすぐで前後両側に三角形の突起があるが,前方のが大きい。右殻には足糸を出す湾入がある。殻の色や模様は個体によって変異があり一定しないが,褐色を帯びたものがもっとも多く,また雲状の斑紋が殻頂のほうにある。
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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