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Chlorophyceae: Chlorococcales: Scenedesmaceae

Scenedesmus acutiformis

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 cells, arranging learly; cell body spindle-shaped, both ends slightly pointed, 10-22 μm long, 5-8 μm wide; each cell with longitudinal ridges on both sides (Illustrations of The Japanese Fresh-water Algae, 1977).