Family: Small, less than 50 μm;
oblong to ovate; ridges faint or absent.
Genus: Body tongue-shaped in locomotion (Illustrated Guide, 1985).
Locomotive, lingulate 16-23 μm long, 12.5-17 μm wide; uroid temporary; ectoplasm clear, pale as anterior half of locomotive body; nucleus indistinct, spherical, 2.5 μm; endosome, 1.0 μm; contractile vacuole none (Illustrated Guide, 1985).
Images of collecting locality:
Kodai-hasu-no-sato park (Ancient lotus park), Gyoda city, Saitama Pref., Japan, March 11, 2006 by Y. Tsukii