Genus: Cell body short, radiate in shape; apical view of the cell, triangular, polygonal, ellipsoidal or spindle-shaped; zygospores formed outside of mother cells (Illustrations of The Japanese Fresh-water Algae, 1977)
Subgenus: lacks arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977)
Species:
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Similar species -- >> S. punctulatum;
S. varians
34 x 32 μm
Iruma river
Sayama
Saitama, 2004
S. varians
or S. punctulatum ?
31 x 28 μm
Senuki
Nasu
Tochigi, 2004
