Abstract
Recent progress in study on rhythms of micro-growth striation formation (consisting of alternating growth line and growth increment) in bivalves is reviewed herein. Subtidal bivalves have various average frequency of the striation formation. Periodicities such as daily and 1/2 daily ones are known. Involvement of biological clock in keeping these rhythms are doubtful. Rather, it seems that the periodic fluctuation of environmental factors induces these rhythms. Non-periodic formation seems to be more common. Intertidal bivalves form one growth line at each low tide, provided they are exposed. Growth lines of tidal exposure origin are arranged into specific patterns reflecting the tidal type of bivalve's habitats and their relative height in intertidal zone. These patterns have been successfully used in recognizing intertidal bivalves among fossil material or material from archaeological sites.
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