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 4, 8 cells, arranging linearly; cell body elongated spindle-shaped, with
distinct ridges on both sides, 12-28 μm long, 5-8 μm wide;
outer cells with long spiny projections on both ends; inner cells with two dented projections
on both ends (Illustrations of The Japanese Fresh-water Algae, 1977).
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