Studies on the Molluscan Fauna around Shionomisaki, Southern Tip of the Kii Peninsula, Pacific Coast of Japan I : Distributions of Callista chinensis and C. pilsbryi in the Offshore Area to the West of Kushimoto

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  • 紀伊半島潮ノ岬周辺海域における貝類相の研究 I : 串本西岸沖合のマツヤマワスレガイとコマツヤマワスレガイの分布
  • 紀伊半島潮ノ岬周辺海域における貝類相の研究-1-串本西岸沖合のマツヤマワスレガイとコマツヤマワスレガイの分布
  • キイ ハントウ シオノミサキ シュウヘン カイイキ ニ オケル カイルイソウ

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This paper deals with the distributions of two venerid bivalves, Callista chinensis and C. pilsbryi, determined from 83 dredgings between the depths of 5-65 m to the west of Kushimoto, at the tip of the Kii Peninsula on the central part of the Pacific coast of Japanese main island, Honshu, during 1979. A morphological comparison between both species is made, and, in addition, geographical differences in shell morphology between C. pilsbryi and C. amamiensis at various localities in Japan are examined. Callista chinensis was found in fine sand at depths of 5-45 m with its distribution centered around 15-30 m, while C. pilsbryi was collected from coarse sand at depths of 20-45 m and its distribution centered around 25-40 m. The boundary between the bathymetrical distribution of these two species is determined by topography and sediment type rather than by depth alone. Comparison of the pallial line between C. chinensis and C. pilsbryi demonstrated that the latter has a wide-angled pallial sinus. The relationship between the shell-height/shell-length ratio and the shell-width/shell-length ratio shows that C. pilsbryi has a more rotundate and inflated profile than that of C. chinensis. Callista amamiensis is higher in height and more convex in breadth than C. pilsbryi.

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