Only 1 flagellum emergent from canal, colourless; eyespot present;
cell body semi-rigid, but can bend and loop; elongated, tapering;
paramylon grains needle-like;
several species, freshwater (Illustrated Guide, 1985).
Species: Long, thin, 120-210 μm long, 5-15 μm wide; cell glides when not swimming; eyespot pale orange; long paramylon needles (25-30 μm) (Illustrated Guide, 1985).
Images of collecting locality:
Block 2-1, Kashibaru marsh, Karatsu city, Saga Pref., Japan, September 9, 2008 by Y. Tsukii