Genus: Cell body cylindroid or spindle in shape; spiral ribbon-like chloroplasts or laminae of the chloroplast arranged spirally around central rod (Illustrations of The Japanese Fresh-water Algae, 1977).
Species : Vegetative cells small spindle-shaped, 25.5-30 μm long, 6-7 μm diam., band-form chloroplasts making 2 turns (Illustrations of The Japanese Fresh-water Algae, 1977).
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S. beijerinckii
44 x 7 μm
Koigakubo marsh
Tessei-cho
Okayama, 2004
S. beijerinckii
23-35 x 7 μm
Fujioka
Tochigi, 2001
