Genus: Colonies of 4 (or 2, 8, 16) cells attached side by side, arranged linearly or zigzag;
cell body elliptical or spindle or crescent in shape; terminal cells with spiny projections in many species;
cell wall usually smooth, but in some species granulated or dented or ridged
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body spindle-shaped, 10-28 μm long, 2.5-8 μm wide;
4-8 cells attached side by side (1 or 2 rows); without spiny projections;
outer cells slightly curved inward, inner cells straight
(Illustrations of The Japanese Fresh-water Algae, 1977).
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