Genus: Highly flattened; pellicle firm; body form constant (Kudo, 1966).
Chloroplasts small, discoid, pyrenoids usually absent; most species flat and leaf-shaped;
often with ridges or fins running helically or longitudinally (Illustrated Guide, 1985).
Species: 40-55 μm long,
32-40 μm wide; a short caudal projection;
pellicle with minute knobs arranged in longitudinal rows; flagellum about the body length (Kudo, 1966).
43-54 μm long; pointed rear;
incurved anteriorly with small papilla; striated, about 12 rows of small knobs; fresh water
(How to know the protozoa, 1979).
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