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: cell body 41 μm long, 473 μm wide (with spines), constriction 13 μm wide, (Illustrations of The Japanese Fresh-water Algae, 1977)
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S. aculeatum
v. aculeatum ?
μm
Dojo-ike 2
Norikura highland
Nagano, 2007
S. aculeatum
v. japonicum
35 x 50 μm
Dojo-ike
Norikura highland
Nagano, 2006
S. aculeatum
v. japonicum
33 x 35 μm
Japan, 1998
S. aculeatum ?
18 x 22 μm
Uruguay, 1999
S. aculeatum ?
26 x 27 μm
Uruguay, 1999
