A Fossil Cyprinid Fish preserved in Seison-kaku, Kanazawa City

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  • 金沢市成巽閣所蔵のコイ科魚類化石
  • カナザワシ セイタツミカク ショゾウ ノ コイカ ギョルイ カセキ

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The writer examined a fish fossil which had been discovered in 1787 and has been preserved in Seison-kaku at Kenroku park, Kanazawa, Ishikawa Prefecture. It seems that the fossil was excavated from a Miocene sediment in Ishikawa Prefecture, though the exact horizon and locality is unknown because of imperfection of the record. Judging from the remains of the Weberian apparatus, pharyngeal teeth, and other characters, it is apparent that the fish was a member of the family Cyprinidae (Teleostei, Cypriniformes). Furthermore, the fish can be regarded as a form either closely related or belonging to the genus Zacco, because of the existence of the very long anal fin rays and a relatively large orbit. The relation with living Zacco species of China is not clear, but at least this fish is different from any of Japanese Zacco species, Z. platypus and Z. temmincki, in view of the arrangement of the 1st pterygiophore of the dorsal fin in relation to the neural spine of the llth vertebra.

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