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, 29 μm in diam.,
tentacles up to 60 μm long,
x 640, Kurihashi, Saitama Pref., Japan, July 2001 by Y. Tsukii
94 μm; x 640