Genus: Unicellular; variable in shape; a constriction at the center of the cell body; mostly longer than wide; flattened; each semicell hemispherical, spherical, ellipsoidal, rectangular, pyramidal or kidney-shaped; no apical indentation (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body 39-(42-43) μm long, 33-24 μm wide, constriction 9.5-(11-12.7) μm wide, (Illustrations of The Japanese Fresh-water Algae, 1977).

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C. quinarium 39 x 38 μm USA, 1999

C. quinarium 45 x 36 μm Oze-ga-hara Katashina Gunma, 2006

Similar species -->> C. furcatospermum;

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