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: with arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977)
Species: (Illustrations of The Japanese Fresh-water Algae, 1977)
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S. inflexum ?
x 40 μm
Omotsubo marsh
Tetta-cho
Okayama, 2004
S inflexum ?
x 26-42 μm
Kodanuki marsh
Fujinomiya
Shizuoka, 2006
