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 reniform in side view, broad-ellipsoid in face view, (6-) 10-20 μm long, (3-) 6-10 μm wide, attached by their convex side to radially, di- or tetrachotomously branced filaments; a single chloroplast cup-shaped, lying at the convex side of the cells, with a pyrenoid (Photomicrographs of the Freshwater Algae, vol. 5, 1986).

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Cell body cup-shaped
D. reniforme cell 7 x 4 μm Japan, 1998	D. reniforme cell 9 x 6.5 μm Uruguay, 1999	D. reniforme ? cell 10 x 6 μm Japan, 2000	D. reniforme cell 7 x 5 μm Kawagoe Saitama, 2001
D. reniforme cell 9 x 7 μm Mizumoto park Tokyo, 2001	D. reniforme cell 8 x 6 μm Mizumoto park Tokyo, 2001	D. reniforme cell 7 x 5 μm Kasuga Fukuoka, 2001	D. reniforme cell 9 x 8 μm Nasu Tochigi, 2001
D. reniforme ? cell μm Sayama Saitama, 2001	D. reniforme stock Ssa-3, 5, 9 cell 7 x 6 μm Sayama Saitama, 2001	D. reniforme cell 8 x 7 μm Otto-Numa Tsuchiura Ibaraki, 2002	D. reniforme cell 8 x 7 μm Heisei-no-mori Park Kawashima or Kawajima Saitama, 2002
D. reniforme cell 7 x 4 μm Otto-Numa Tsuchiura Ibaraki, 2002	D. reniforme cell μm Iruma River side Tsurugashima Saitama, 2003	D. reniforme cell μm O-ike park Yabuki Fukushima, 2003	D. reniforme cell μm Higusa-numa Hikari Chiba, 2003
D. reniforme cell μm Aobano-mori p. Chiba Chiba, 2003	D. reniforme ? μm φ Kijioka Castle Ruin Kodama Saitama, 2003	D. reniforme ? 3-5 x 5-6 μm Hasu-ike Shiga highland Nagano, 2005	D. reniforme ? 6 x 7 μm Tane-ike Togakushi highland Nagano, 2005
D. reniforme cell 7 x 5 μm Tane-ike Togakushi highland Nagano, 2005

Similar genus -->> Planktosphaeria; Westella;

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