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: Coloies of 4, 8 cells, attached adjacent cells at the center, arranging linearly; cell body spindle-shaped, 12-28 μm long, 5-8 μm wide; outer cells with long spiny projections 5-28 μm long; inner cells sometimes with a short spines (Illustrations of The Japanese Fresh-water Algae, 1977). Cells arranging lineary but not on a flat plane, outer cells attached inner cells slightly frontal side, thus forming a plane curve.

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S. opoliensis ? ridges present cell 19 x 7.5 μm Umi-no-nakamichi Fukuoka, 2001	S. opoliensis ? stock Fum-1, 4, 5 cell 19 x 7.5 μm Umi-no-nakamichi Fukuoka, 2001	S. opoliensis ? ridges present cell 17 x 7 μm Koriyama Fukushima, 2001	S. opoliensis cell 17-19 x 5.5-7 near Ayu river Fujioka Gunma, 2004
S. opoliensis ? ridges present cell 18 x 7 μm Shiroyama Park Okegawa Saitama, 2006	S. opoliensis ridges present cell μm Nogyo Fureai p. Toride Ibaraki, 2008

Similar species -->> S. carinatus; S. protuberans; S. quadricauda; S. circumfusus;

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