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:
390-(430-580)-800 μm long,
4-(5-7)-8 μm wide,
L/W = 73-135; cell body very long, slightly curved, tapered at both termini;
cell wall transparent, lack bands
(Illustrations of The Japanese Fresh-water Algae, 1977).
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