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 cylindrical, outer cells slightly curved outward, 9.5-11 μm long, 3.5-4 μm wide; each cell with three short spiny projections at both ends (Illustrations of The Japanese Fresh-water Algae, 1977).

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S. lunatus ? cell 16 x 7 μm Uruguay, 1999	S. lunatus ? cell 13 x 6 μm Kasuga Fukuoka, 2001	S. lunatus ? cell μm Kiyose Tokyo, 2003	S. lunatus ? cell μm Lake Biwa Maihara Shiga, 2003
S. lunatus ? cell 8 x 3.5 μm Kiyose Tokyo, 2001	S. lunatus ? 10-12 x 3-3.5 μm Showa Memorial p. Tokyo, 2001

Similar species -->> S. denticulatus; S. brasiliensis;

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