Family: Cell body cylindrical or spindle-shaped, loosely attached with each other to form a filamentous colony; cell wall smooth, consists of a single partition, one layer; 1-2 chloroplasts plate- or ribbon-like, with pyrenoids; a single nucleus centrally placed.
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).
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Spirotaenia obscura -->> Tortitaenia obscura;
S. condensata
33 samples
95-260 x 20-27 μm
1999-2008
S. erythrocephala
4 samples
59-87 μm
2003-2008
S. diplohelica
58 x 11 μm
Imou bog
Toyohashi
Aichi, 2004
S. beijerinckii
2 samples
23-44 μm
2001-2004
