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:

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Cell body pear-shaped
D. elegans 6 x 3.5 μm Shikinawa-ike Fukuoka, 2001	D. elegans 5 x 3.5 μm Sue-machi Fukuoka, 2001	D. elegans 7 x 5 μm Uruguay, 1999	D. elegans 6 x 4 μm Japan, 2000
D. elegans 6 x 4 μm Uruguay, 1999	D. elegans 4 x 3 μm Bessho-numa Saitama, 2001	D. elegans cell pear-shaped ? 4.5 x 3 μm Kaga Ishikawa, 2001	D. elegans ? cell pear-shaped ? 6 x 4.5 μm Gyoda Saitama, 2001
D. elegans 7 x 4 μm Sanda Hyogo, 2001	D. elegans μm Omine-numa Tsukiyono Gunma, 2003	D. elegans ? axenic culture 4.5 x 3 μm Kaga Ishikawa, 2000	D. elegans ? 5 x 3 μm Karasu-ga-mori p. Nishi-nasuno Tochigi, 2004
D. elegans 5 x 3 μm Oisezuka Park Kawagoe Saitama, 2006	D. elegans μm Kannon-numa Shimogo Fukushima, 2008

Similar genus -->> Planktosphaeria; Westella;

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