Subgenus [Eucosmarium]: Cell body dorso-ventrally compressed, with strong constriction at the center, transverse section elliptical or diamond-shaped.
Section [ Cyclidium ]: Cell surface smooth; semicells half circle, half ellipsoid (Illustrations of The Japanese Fresh-water Algae, 1977).
Species[ magnum ]: Cell body 78-84 μm long, 78-80 μm wide, isthmus 39-44 μm wide; (Illustrations of The Japanese Fresh-water Algae, 1977).

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C. taxichondrum var. magnum 84 x 80 μm Koigakubo marsh Tessei-cho Okayama, 2004

C. taxichondrum var. magnum 86.5 x 89 μm Koigakubo marsh Tessei-cho Okayama, 2006

C. taxichondrum var. magnum 100 x 95 μm Yamamuro m.8 Maibara Shiga, 2008

Similar species -- >> C. obsoletum; C. ralfsii;

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