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. longispina cell 11 x 3-6 μm S/L=2.4 Nishi-nasuno Tochigi, 2001 |
S. longispina axenic culture cell 10 x 4 μm S/L= 2.5 Umi-no-nakamichi Fukuoka, 2001 |
S. longicauda ? cell μm O-ike park Yabuki Fukushima, 2003 |
S. longicauda ? cell 8 x 2.5 μm Kurome river Asaka Saitama, 2006 |
S. longicauda cell 12 x 3.5 μm Showa-machi g.p. Showa Saitama, 2006  |
