Genus: Biflagellate, both arising from anterior end; one directed anteriorly and the other runs backward
over body surface as a trailing (recurrent) flagellum; body plastic (Kudo, 1966).
Small (10-15 μm);
body is generally pyriform to cylindrical
except for an ameboid variable posterior (Illustrated Guide, 1985).
Images of collecting locality:
Drainage ditch near Kondo-numa (Kondo pond) park, Tatebayashi city, Gunma Pref., Japan, February 18, 2006 by Y. Tsukii