|  Genus: 
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).
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