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 (48-) 85-330 μm long, (55-) 60-85 μm diam., 3-4 chloroplasts making 1-3 turns in each cell (Illustrations of The Japanese Fresh-water Algae, 1977).

S. ternata 3 chl., 1.5 turns 83-183 x 78 μm Saitama, 1999	S. ternata 3 chl., 3 turns 112 x 75 μm Tochigi, 1997	S. ternata 3 chl., 3.5 turns x 88 μm Japan, 1998	S. ternata 3 chl., 2.5 turn x 69 μm Saitama, 2001
S. ternata 3 chl., 2 turn x 78 μm Ikoi-no-mori p. Fuchu Tokyo, 2004	S. ternata 3 chl., 1.5 turns 105 x 71 μm Saitama, 1999	S. ternata 3 chl., 2.5 turns 155 x 78 μm Nanbata-shinden Fujimi Saitama, 2004	S. ternata 3 chl., 1.7 turns 90-110 x 78 μm Shimo-nanbata Fujimi Saitama, 2006
S. ternata 4 chl., 1-2 turns 95-100 x 78-83 μm near Michi-no-Oasis Shobu Saitama, 2004	S. ternata 4 chl., 1 turn x 72 μm Kitayama park Higashi-Murayama Tokyo, 2006	S. ternata ? 5 chl., 2 turns x 72 μm Mogami Central p. Shinjo Yamagata, 2006

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