貝類学雑誌

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Three living species of Trisidos had been known by Japanese authors. They are Japanese Trisidos kiyonoi (Makiyama), and Indo-Papific T. semitorla (LAMARCK) and T. tortuosa (LINNAEUS). When IREDALE introduced T. yongei for T. tortuosa of authors, because he maintained that T. tortuosa (LINNAEUS) was closely related to Japanese T. kiyonoi, Japanese authors followed him. The fact is quite different. Trisidos tortuosa (LINNAEUS) is based on the illustrations of four authors : BONANNUS, GUALTIERI, RUMPHIUS, and KLEIN. Though IREDALE pointed out that those illustrations did not show any keel, still I do not agree with him. The figure of BONANNUS is not available to me, but the illustrations of others indicates keeled or strongly angulated specimens. So far as the figures of RUMPHIUS (pl. XIV, fig. 6) and KLEIN (pl. XIV, fig. 1) are concerned, the presence of prominent keel is doubtless. While the illustration of GUALTIERI is ridged rather than keeled (pl. XIV, figs. 2-5). In order to avoid further confusion, I, here, designate KLEIN's figure as the lectotype of Arca tortuosa LINNAEUS. Then Trisidos yongei IREDALE becomes a synonym of T. tortuosa (LINNAEUS).

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