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 nearly spherical, 20 μm in diam.,
tentacles up to 20 μm long, stalk present,
x 640, Shimo-kawahara Park (near Iruma river), Sayama city, Saitama Pref., Japan, March 7, 2005 by Y. Tsukii
94 μm; x 640
Conjugation ?, x 640