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, 4-10 μm long, 3-7 μm wide, attached by their longer sides to radially, dichotomously branched filaments; chloroplasts single, cup-shaped, with a pyrenoid (Photomicrographs of the Freshwater Algae, vol. 1, 1984).

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D. ehrenbergianum cell ellipsoidal 8 x 5 μm Toneri Park Tokyo, 2001	D. ehrenbergianum ? cell ellipsoidal 7 x 3.5 μm Kasama Park Ibaraki, 2002	D. ehrenbergianum ? cell ellipsoidal 8 x 3.5 μm Kawashima or Kawajima Saitama, 2002	D. ehrenbergianum cell ellipsoidal μm Omine-numa Tsukiyono Gunma, 2003
D. ehrenbergianum cell ellipsoidal 6-7 x 3 μm Aquatic botanical g. Sawara Chiba, 2004	D. ehrenbergianum ? cell ellipsoidal 11-13 x 5 μm Senuki Nasu Tochigi, 2004

Similar genus -->> Planktosphaeria; Westella;

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