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 cylindrical, outer cells slightly curved outward,
9.5-11 μm long,
3.5-4 μm wide;
each cell with three short spiny projections at both ends
(Illustrations of The Japanese Fresh-water Algae, 1977).
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