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 spherical, 3-10 μm in diam., attached to radially, dichotomously branched filaments; a single chloroplast cup-shaped, with a pyrenoid (Photomicrographs of the Freshwater Algae, vol. 2, 1984).

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Cell body spherical
D. pulchellum cell spherical 6-8 μm φ near Yamaguchi Univ. Yamaguchi, 2004	D. pulchellum cell spherical 3.5-7 μm φ Uruguay, 1999	D. pulchellum cell spherical 5-7 μm φ Japan, 1998	D. pulchellum cell spherical 7-10 μm φ Japan, 1998
D. pulchellum cell spherical 6-11 μm φ Japan, 1998	D. pulchellum ? cell spherical 7 μm φ Japan, 1998	D. pulchellum cell spherical 5-8.5 μm φ Ueno Tokyo, 2001	D. pulchellum cell spherical 9-10 μm φ Sayama Natural Park Tokyo, 2001
D. pulchellum cell 7 x 6 μm Sanda Hyogo, 2001	D. pulchellum stock Tok-1 axenic culture cell 6 μm φ Otawara Tochigi, 2000	D. pulchellum 8 x 7 μm Akigase Park Saitama, 2002	D. pulchellum cell 6 μm φ Nasu Tochigi, 2001
D. pulchellum cell 6 μm φ Kasama Park Ibaraki, 2002	D. pulchellum ? cell spherical μm φ Otto-Numa Tsuchiura Ibaraki, 2002	D. pulchellum cell spherical μm φ Kijioka Castle Ruin Kodama Saitama, 2003	D. pulchellum ? cell spherical 6 x 5 μm or 5 μm φ Mizumoto Park Tokyo, 2001
D. pulchellum cell spherical μm Chiba-Minato Park Chiba, 2003	D. pulchellum cell spherical 6 μm near Town Hall Shobu Saitama, 2004	D. pulchellum cell spherical 9-10 μm Sankaku-ike Shiga highland Nagano, 2004	D. pulchellum cell spherical 7-8 μm Tane-ike Shiga highland Nagano, 2005

Similar genus -->> Planktosphaeria; Westella;

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