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).
Images of collecting locality:
A drainage ditch near Asou bridge, Inbanuma cycling road, Hoshina, Yachiyo City, Chiba Pref., Japan, March 16, 2008 by Y. Tsukii