Genus: Spherical or ellipsoidal colony composed of 2-50 ovoid cells arranged radially;
cell body usually covered by short bristles; two chloroplasts lateral; no stigma;
longitudinal cell division; fresh water (Kudo, 1966).
Species: Cells oval; bristles conspicuous; 20-40 μm long, 8-17 μm wide (Kudo, 1966).
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50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
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