Light and electron microscope studies of diatom species belonging to the genus Chaetoceros Ehrenberg. I. Chaetoceros septentrionale Oestrup

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Abstract
The ultrastructural detail and a schematic reconstruction of the silica shell of Chaetoceros septentrionale Oestrup are presented. The material for this study was derived from cultured material from four sources in Pacific and Atlantic coastal waters. A significant finding is the participation of the valvar costae in the formation of the setae. Three types of girdle bands are described. The first girdle band is equipped with horns that project upward into the basal parts of the setae. These findings are compared with previous descriptions of Ch. septentrionale and other members of the genus Chaetoceros, particularly in reference to the differentiation of girdle bands and intercalary bands.

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