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 :

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S. erythrocephala 67 x μm Namegawa Saitama, 2003

S. erythrocephala ? 86 x 17 μm Iida-shinden Nishi-ku Saitama, 2004

S. erythrocephala 59 x 13.5 μm Tsukamoto Sakura-ku Saitama, 2004

S. erythrocephala μm Miyatoko m.5 Minami-Aizu Fukushima, 2008

Similar species -->> Tortitaenia obscura;

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