Abstract

During the evolutionary history of bivalve and gastropod molluscs, not only all the soft parts, but also the shells have changed considerably since the Cambrian period. Moreover, not only the outer shape of a shell, but also the internal shell microstructure has changed during this time. The internal shell microstructure is different in different species and is remarkably well related to bivalve classification. Therefore, shell structure is available for the phylogenetic study of bivalves and other molluscs. The internal shell microstructure expresses one face of molluscan evolution.

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