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).
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
