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 23-40 μm long, 16-30 μm wide, tentacles up to 20 μm long,
x 640, Yanome-dam park, Nasu town, Tochigi Pref., Japan, March 28, 2004 by Y. Tsukii
94 μm; x 640