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 ovoid to long triangular, slightly twisted; anterior broadly rounded, shallowly bilobed;
laterally undulated and asymmetrical; posterior tapered into a long cauda;
paramylon bodies (usually three) cup-shaped parietal plate;
two located in the right and left anterior halves of the cell, one occupying the posterior half of the cell;
cell body 22-26 μm long,
10-13 μm wide
(Photomicrographs of the Freshwater Algae, 1995).
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