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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: Cell body small, slightly curved, slightly swelled at the center, 60-160 μm long, 7-20 μm wide, L/W=6-9; both ends truncated; cell wall smooth, transparent; semicells with 1-4 pyrenoids (Illustrations of The Japanese Fresh-water Algae, 1977).