Family: Unicells or cells loosely attached forming hyphae; cell body varied in shape, a constriction at the center in most species; cell walls consisting of two or more parts, with small pores and various ornaments (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus:

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C. constrictum 17 x 11 μm Kamitashiro Oze-ga-hara Gunma, 2006

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