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 spindle-shaped, 10-28 μm long, 2.5-8 μm wide; 4-8 cells attached side by side (1 or 2 rows); without spiny projections; outer cells slightly curved inward, inner cells straight (Illustrations of The Japanese Fresh-water Algae, 1977).
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S. incrassatulus cell 16 x 5 μm Japan, 1998 |
S. incrassatulus cell 12 x 6 μm Kiyose Tokyo, 2001 |
S. incrassatulus ? stock Sak-6b cell 14 x 5 μm axenic culture Saitama, 2000 |
S. incrassatulus ? stock Sak-6b cell 14 x 8 μm axenic culture Saitama, 2000 |
S. incrassatulus or S. ecornis ? cell 15 x 4.5 μm Uruguay, 1999 |
S. incrassatulus ? or S. ecornis ? 12-16 x 3-5.5 μm Nasu Tochigi, 2000 |
S. incrassatulus ? or S. ecornis ? cell 11 x 4.5 μm Showa Memorial p. Tokyo, 2001 |
S. incrassatulus ? or S. ecornis ? cell 11-13 x 2.5-4 μm Ikenokochi marsh Tsuruga Fukui, 2004 |
S. incrassatulus or S. asymmetricus ? cell 12 x 3 μm near Imori pond Myoko highland Niigata, 2004 |
