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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v. subavicula
μm
Numappara marsh
Nasu-shiobara
Tochigi, 2003
v. subavicula ?
μm
Numappara m.3
Nasu-shiobara
Tochigi, 2007
v. subavicula
25 x 25 μm
near Iroha marsh
Zao mountain
Yamagata, 2006
v. subavicula
32 x 34 μm
Kowashimizu
Suwa
Nagano, 2007
S. subavicula ?
25 x 28 μm
Kashibaru m.5
Karatsu
Saga, 2006
