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: Colonies of 2, 4 cells arranging linearly; cell body ellipsoidal, both ends rounded,
8-13 μm long, 2-4.5 μm wide; outer cells with a spiny
projection (3-13 μm long) at one end
(Illustrations of The Japanese Fresh-water Algae, 1977).
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