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Genus: Cell body crescent in shape (long, curved, tapered at both ends); cross section rounded;
cell wall smooth or with longitudinal lines, bands on the cell wall in some species;
chloroplast laminae ridged and radially arranged, which makes cross section star-shaped;
pyrenoids aligned or scattered (Illustrations of The Japanese Fresh-water Algae, 1977).
Species:
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50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
C. navicula (Brébisson) Lütkemüller: Cell body not curved spindle or boat in shape; 24-(35-84)-93 μm long, 8-(11-20)-22 μm wide; L/W = 3-4; a single chloroplast and 1 or 2 pyrenoids in each semicell (Illustrations of The Japanese Fresh-water Algae, 1977).
C. libellula Focke var. libellula: Similar to C. navucula (not curved, spindle or boat in shape) but large; 170-(216-224)-450 μm long, 30-(42-48)-52 μm wide; L/W = 5-8; chloroplast with 8-12 ridges; 3-5 pyrenoids in each semicell (Illustrations of The Japanese Fresh-water Algae, 1977).
* C. libellula var. intermedium (Roy et Bisset) G. S. West: Smaller than var. libellula; 75-(123-174) μm long, 15-(20-32)-36 μm wide; 3-4 pyrenoids in each semicell (Illustrations of The Japanese Fresh-water Algae, 1977).
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