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 [ var. acuminatus ]: Colonies of 4 or 8 cells; cells arranging linearly (4 cells) or zigzag
(8 cells); cell body elongated spindle-shaped, outer cells curved outward,
12-30 μm long, 2.5-6 μm wide; cell wall smooth
(Illustrations of The Japanese Fresh-water Algae, 1977).
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