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).
cell body spherical, 14 μm in diam., tentacles up to 18 μm wide,
x 640, Senjo-ga-hara (marsh), Nikko city, Tochigi Pref., Japan, September 2003 by Y. Tsukii
94 μm; x 640