Genus: Filament without branching; cell body cylindrical; one or several chloroplasts band-shaped, spirally arranged within the cell, pyrenoids present; septum with or without folded structure (Guide book to the "Photomicrographs of the Freshwater Algae", 1998). About 300 species (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Vegetative cells (50-) 58-165 μm long, (43-) 48-58 μm diam., 2 chloroplasts making 2-3.5 turns in each cell (Illustrations of The Japanese Fresh-water Algae, 1977).

S. distenta 2 chl. 2-2.5 turns spherical nuc. 112 x 53 μm Japan, 1998	S. distenta 2 chl. 2 turns spherical nuc. x 53 μm Shizuoka, 2001	S. distenta 2 chl. 3 turns spherical nuc. x 49 μm Ikoi-no-mori p. Fuchu Tokyo, 2004	S. distenta 2 chl. 2.5 turns spherical nuc. x 53 μm Karasu river Takasaki Gunma, 2004
S. distenta 2 chl. 2 turns conjugation x 53-58 μm near Michi-no-Oasis Shobu Saitama, 2004

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