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: with arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977)
Species [var. pelagicum ]: Semicells elongate cup-shaped (excluding arms); cell body 40-46 μm long (excluding arms), 50-65 wide (including arms), isthmus 12-13 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977)
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S. anatinum ?
stock Fsn-1
December 13, 2001
Sue-machi
Fukuoka, 2001
S. anatinum ?
stock Fsn-1
January 19, 2002
Sue-machi
Fukuoka, 2001
S. anatinum
3 arms
Lake Kawaguchi
Yamanashi, 2001
S. anatinum
Ko-numa
Tsukiyono
Gunma, 2001
S. anatinum ?
μm
Doman-green p.
Saitama, 2003
S. anatinum ?
μm
Doman-green p.
Toda
Saitama, 2007
S. anatinum ?
x 85 μm
Murakuni ike
Iwatsuki-bunka p.
Saitama, 2006
