Species: Cell body strongly curved, gradually tapered toward ends, both ends rounded, 175-(225-300) μm long, 16-(22-25)-30 μm wide, L/W = 10-12; cell wall brownish in color, striated (5-6/10 μm); chloroplasts with 3-4 laminae, 5-7 pyrenoids in each semicell (Illustrations of The Japanese Fresh-water Algae, 1977).

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C. archerianum or C. regulare ? 280 x 25 μm L/W=11.2 Iroha-numa Zao mountain Yamagata, 2005

C. archerianum or C. regulare ? 324 x 25 μm L/W=13.0 Iroha-numa Zao mountain Yamagata, 2005

Similar species -->> C. rostratum; C. intermedium;

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