Species: Cell body 58-75 μm long, 26.5-31 μm wide, L/W=2-2.5, isthmus 20-29 μm wide; semicells broad ellipsoidal or ovoidal, apex broad circular or narrowly flattened; cell wall finely dotted; band-form chloroplasts aligned along inner cellwall (Illustrations of The Japanese Fresh-water Algae, 1977).

Similar species -->> C. cucurbita; C. cucurbitinum; C. diplosporum; C. globosum; C. oblongum;

μm wide, x 640, Tanohara Natural Park, Ontake highland, Otaki town, Nagano Pref., Japan, June 26, 2005 by Y. Tsukii
31 μm 63 μm 94 μm; x 640

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