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
Species: Cell body 25-47 μm long, 26-50 μm wide, isthmus 8-11 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977)

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S. lunatum 28 x 29 μm Kejo-numa Furukawa Miyagi, 2003	S. lunatum 33 x 33 μm Kejo-numa Furukawa Miyagi, 2006	S. lunatum 33 x 30 μm Ishinazaka Furukawa Miyagi, 2003	S. lunatum ?? x 33 μm 30 x 30 μm Dojo-ike Norikura highland Nagano, 2006
S. lunatum μm Dojo-ike Norikura highland Nagano, 2007	S. lunatum 29 x ?? μm Maimeno-ike Norikura highland Nagano, 2006

Similar species -->> S. connatum;

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