Genus: Elongate, with a broad rounded or truncate posterior end during locomotion; highly plastic;
delicate pellicle shows a fine striation; a free flagellum, long and conspicuous, tapers toward free
end; a second flagellum adheres to the pellicle; a contractile vacuole, anterior, close to the reservoir
(Kudo, 1966).
Species: 40-70 μm long (Kudo, 1966); 20-80 μm long (Illustrated Guide, 1985); 20-70 μm long (How to know the protozoa, 1979). 22-70 μm long, 10-20 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977). Anterior flagellum nearly the same as the cell body in length; 54-81 μm long, 15-25 μm wide (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).
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50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
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