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 broad ovoidal, 8.5-16 μm long, 4-7 μm wide; spiny projections of outer cells short (3-7 μm long) (Illustrations of The Japanese Fresh-water Algae, 1977).

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S. quadrispina μm S/L= Daidarabotchi-ike Iizuna-kogen Nagano, 2003	S. quadrispina ? 13-14 x 5 μm S/L=0.9 Kayoicho-ike Fukuoka, 2001	S. quadrispina ? 15-16 x 6 μm S/L= Imori pond Myoko highland Niigata, 2004	S. quadrispina ? μm S/L= near Imori pond Myoko highland Niigata, 2004
S. quadrispina ? 15 x 4 μm 14 x 5 μm S/L=0.5 near Railroad St. Ichinoseki Iwate, 2005	S. quadrispina ? 12 x 5 μm S/L= Kusatsu Onsen b.t. Kusatsu Gunma, 2005

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