Family: Small, spherical or pyriform trophonts; tentacles apical or evenly distributed;
swarmers with broad equatorial band of cilia (Illustrated Guide, 1985).
Genus: No stalk (Illustrated Guide, 1985).
Species:
Sphaerophrya sp.,
cell body μm long, μm wide,
x 400, x 640, Tone river, near Jomo-kogen railway station, Tsukiyono town, Gunma Pref., Japan, September 2003 by Y. Tsukii
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640