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:

C. repandum 19 x 14.5 μm Imou bog Toyohashi Aichi, 2004	C. repandum 15.5 x 13 μm Aquatic botanical g. Sawara Chiba, 2004	C. repandum 20 x 17 μm Nagaike park Hachioji Tokyo, 2005	C. repandum 19 x 16 μm Lake Shirakaba Tateshina & Chino Nagano, 2005
C. repandum 22 x 18 μm Junichogata s.k. Himi Toyama, 2006	C. repandum ? 21 x 13 μm Kumakubo Nasu-shiobara Tochigi, 2005

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