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 broad ovoidal, 8.5-16 μm long, 4-7 μm wide;
spiny projections of outer cells short (3-7 μm long)
(Illustrations of The Japanese Fresh-water Algae, 1977).
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