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 fusiform, straight or slightly curved, both ends drawn out,
28-50 μm long, 4-8 μm wide;
cells arranged alternately contacting with their apices and median portion of adjacent cells in a linear series;
cell wall smooth, without teeth or spines
(Photomicrographs of the Freshwater Algae, vol. 15, 1995).
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