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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Similar species -->> Tortitaenia obscura;
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