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: Colonies of 4, 8 cells, arranging linearly; cell body elongated spindle-shaped, with distinct ridges on both sides, 12-28 μm long, 5-8 μm wide; outer cells with long spiny projections on both ends; inner cells with two dented projections on both ends (Illustrations of The Japanese Fresh-water Algae, 1977).
S. carinatus μm long spines and ridges Iruma City Museum Saitama, 2003 |
S. carinatus μm Higusa-numa Hikari Chiba, 2003 |
S. carinatus ? μm long spines and ridges Iruma City Museum Saitama, 2003 |
S. carinatus ? long spines and ridges Tochigi, 2001 |
S. carinatus long spines and ridges Sa-numa park Shimotsuma Ibaraki, 2003 |
S. carinatus long spines and ridges Shirahata-Numa Urawa Saitama, 2005 |
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S. carinatus ? L/W= Showa-machi G.P. Showa Saitama, 2003 |
S. carinatus ? 17 x 4 μm Showa-machi G.P. Showa Saitama, 2006  |
S. carinatus ? L/W= Showa-machi G.P. Showa Saitama, 2006 |
