Section [ Actinotaenium ]: Cell body cylindrical, slightly constricted at the center, cell surface smooth or dotted or punctated (Illustrations of The Japanese Fresh-water Algae, 1977).
Species [var. capax]: Cell body 134-168 μm long, 66-95 μm wide, L/W=2, isthmus 54-90 μm wide. [var. minus]: Cell body (66-112)-120 μm long, (50-60)-64 μm wide, isthmus (48-56)-59 μm wide, (Illustrations of The Japanese Fresh-water Algae, 1977).

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v. capax or C. connatum ? 126 x 79 μm Imou bog 2 Toyohashi Aichi, 2006.9

C. capax var. minus slight constriction 88 x 50 μm Hiroshima, 1998

C. capax var. minus slight constriction 73 x 45 μm Kurihashi Saitama, 2001

C. capax ? var. minus slight constriction 46 x 28 μm Fukasaku Saitama, 2002

Similar species -- >> C. australe;

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