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: Cell body 25-30 μm long,
24-26 μm wide,
broad ovoid or nearly spherical at dorsal view; dorso-ventrally grooved;
tail region short, not straight; two disc-shaped paramylons;
a flagellum two-times longer than the body length
(An illustrated guide to freshwater zooplankton in Japan, 2000).
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