Genus: Body more or less ovo-cylindrical; rigid with spirally striated pellicle;
often with a short posterior spinous projection; stigma sometimes present;
discoidal chromatophores (chloroplasts) numerous and marginal; paramylum bodies usually
large and ring-shaped, laterally disposed; without pyrenoids; fresh water (Kudo, 1966).
Species: Body 20-40 μm long (Kudo, 1966).
Ovoid with short anterior process and a longer posterior spine; fresh water (How to know the
protozoa, 1979).
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