Cymbella mexicana (Ehrenb .) Cleve var . mexicana was collected from Tama-gawa (Tama River), Tokyo . The fine structure of the species was examined by scanning electron microscopy (SEM), with special reference to colony formation and band morphology . A mature cingulum of this species is usually composed of four open bands . The correlation between the position of the second band (B2) of the cingulum and the attaching pole of the frustule is discussed .
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