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Detail showing plastids inside several cells at the end of a filament. Same filament as included in another picture in this collection.
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Actinoptychus heliopelta.
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Navicula excavata.
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Valves are cylindrical terminating in a proboscis. Processes are absent. This is a temprate, coastal species.
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Valves are rectangular in girdle view and elliptical in valve view. Each cell has four ribbon like and folded chloroplasts, two along each side of the girdle.
