Family: Small, spherical or pyriform trophonts; tentacles apical or evenly distributed;
swarmers with broad equatorial band of cilia (Illustrated Guide, 1985).
Genus: On a stalk (Illustrated Guide, 1985).
cell body 17 μm long, 20 μm wide, tentacles up to 23 μm long,
x 640, rice field, near City Hall, Fujimi city, Saitama Pref., Japan, July 11, 2004 by Y. Tsukii
94 μm; x 640