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 (Prostaurastrum): Body lacks arm-like projections
Species: (Illustrations of The Japanese Fresh-water Algae, 1977)
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S asterias
6 arms, x 640
Uruguay, 1999
S asterias
6 arms, x 640
Shikinawa-ike
Fukuoka, 2001
S asterias ?
6 arms, x 640
Yamagata, 1999
S asterias ?
6 arms, x 640
Ishikawa, 2000
S asterias
μm
O-ike park
Yabuki
Fukushima, 2003
