Species : Cell body small in size (length = width), 12-16.7 μm long, 9.5-15.5 μm wide, isthmus 4.3-5.6 μm wide; semicells ellipsoidal, apex broadly convex or nearly flat (Illustrations of The Japanese Fresh-water Algae, 1977).

C. inconspicuum 12.5 x 10 μm Omine-numa Tsukiyono Gunma, 2003

C. inconspicuum μm Kataki-numa Yuri-Honjo Akita, 2008

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