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).

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D. tetrachotomum cell ovoid 3-7 μm φ Abiko Chiba, 2000	D. tetrachotomum cell ovoid 6-8 μm φ Umi-no-nakamichi Fukuoka, 2000	D. tetrachotomum cell ovoid μm φ Omine-numa Tsukiyono Gunma, 2003	D. tetrachotomum cell ovoid μm φ Omine-numa Tsukiyono Gunma, 2003
D. tetrachotomum cell ovoid 6-7 x 5-6 μm Futayo-no-ike Haguro mountain Yamagata, 2005	D. tetrachotomum cell ovoid 7 x 6-7 μm 8 x 6-8 μm Kannon-numa Shimogo Fukushima, 2005	D. tetrachotomum cell ovoid 10 x 8 μm near Omine numa Minakami Gunma, 2006

Similar genus -->> Planktosphaeria; Westella;

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