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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S. arachne x 48 μm Karakemi marsh Omachi Nagano, 2006	S. arachne x 40 μm Kashibaru marsh Karatsu Saga, 2006	S. arachne μm Kashibaru m.4 Karatsu Saga, 2008	S. arachne μm Kannon-numa 11 Shimogo Fukushima, 2008
S. arachne μm Water reservoir Iiyama Nagano, 2008	S. arachne μm Kareki-numa Nikko Tochigi, 2008

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