Species: Cell body large, L/W=5-8; inner-side nearly straight, outer-side curved;
tapered at both termini (broad circle, slightly inversed); cell wall smooth, transparent, without bands;
chloroplasts with many pyrenoids;
[var. lunula] 250-(430-552)-1000 μm long,
47-(73-89)-120 μm wide
(Illustrations of The Japanese Fresh-water Algae, 1977).
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C. lunula (Müller) Nitzsch var. lunula: 250-(430-552)-1000 μm long, 47-(73-89)-120 μm wide; cell body large, nearly straight; cell wall smooth; many chloroplasts with many pyrenoids (Illustrations of The Japanese Fresh-water Algae, 1977).
C. lunula var. biconvexum Schmidle: (455)-603 μm long, (85)-97-126 μm wide; cell body more or less curved (Illustrations of The Japanese Fresh-water Algae, 1977).