Theoretical Morphology of Composite Prismatic, Fibrous Prismatic and Foliated Shell Microstructures in Bivalves

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  • UBUKATA Takao
    Institute of Geosciences, Faculty of Science, Shizuoka University

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  • 二枚貝殻体における混合稜柱構造, 繊維稜柱構造, 葉状構造の理論形態

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Geometric features of aggregated biomineral units were examined in a total of 13 species of the Bivalvia both theoretically and empirically. Fibrous prisms and foliated blades on the external shell surface and composite prisms in shell section parallel to the outer shell surface were studied. As a result of SEM observation, it was clarified that microstructural units tend to be slightly oblique with respect to growth lines in the ventral direction near the anterior or posterior shell margin. The angle between the biomineral unit and growth lines varies within a single valve. These geometric features of the microstructures are well reproduced by computer simulation when the growth rate of the structural unit in the radial direction is larger than that in the transverse direction.

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