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. lunatum;
S. denticulatum
x 28 μm
Ohnuma
Nasu-shiobara
Tochigi, 2006
S. denticulatum
x 33 μm
Lake Tanuki
Fujinomiya
Shizuoka, 2006
