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 elongated ellipsoidal, with 1-2 short spiny
projections at both ends, 9-13 μm long, 3.5-5 μm wide;
each cell with longitudinal rows of small dented projections on both sides;
outer cells have an additional row of dented projections arranging outside
(Illustrations of The Japanese Fresh-water Algae, 1977).
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