Genus: Emergent flagellum mobile throughout its length during swimming; colourless; no eyespot;
cell body rigid; cylindrical, not flattened; canal opening subapical; paramylon and lipid abundant;
fresh water (Illustrated Guide, 1985).
Body rigid, cylindrical, more or less arched; pellicle longitudinally ridged;
a flagellum at apex (Kudo, 1966).
Images of collecting locality:
No.1, a marsh pond at Sensho-ga-hara, near Akita-komagadake (mountain), Shizukuishi town, Iwate Pref., Japan, August 6, 2007 by Y. Tsukii