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 17-25 μm long, 17-25 μm wide (without spines), isthmus 5.6-8 μm wide, (Illustrations of The Japanese Fresh-water Algae, 1977)

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S. apiculatum 19 x 20 μm Uruguay, 1999

S. apiculatum 18 x 19, ? x 17 μm Kashibaru m.5 Karatsu Saga, 2006

S. apiculatum μm Kashibaru m Karatsu Saga, 2008

S. apiculatum μm Nabekura highland Iiyama Nagano, 2008

Similar species -->> S. connatum;

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