Genus: Cells are equal in size (Illustrations of The Japanese Fresh-water Algae, 1977).
Planktonic; colony within a gelatinous sheath; cell body spherical, elliptical or pear-shaped; 4 daughter cells
attached to a filament dichotomously radiating from the center of the colony;
a single chloroplast cup-shaped, with a pyrenoid.
Species: Cell body ovoid, 6-10 μm long, 6-8 μm wide, attached at narrower ends to radially, dichotomously branched filaments; chloroplasts single, cup-shaped, with a pyrenoid (Photomicrographs of the Freshwater Algae, vol. 2, 1984). |
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
D. tetrachotomum Printz: Cell body ovoid, 6-10 μm long, 6-8 μm wide, attached at narrower ends to radially, dichotomously branched filaments; chloroplasts single, cup-shaped, with a pyrenoid (Photomicrographs of the Freshwater Algae, vol. 2, 1984).