Family: Colonies of a fixed number of cells (4, 8, 16, 32, or more) arranged 2- or 3-dimensionally; cells spherical, ellipsoidal, polygonal, etc. in shape; chloroplasts 1 or several, plate-like in shape, with 1 pyrenoid; asexual reproduction by autocoenobium (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Planktonic; colony of 4 (or 2 or 8) cells; cell body crescent in shape, both ends drawn out as spiny projections; two cells attached each other at the outward mid-region forming "X"-shaped pairs, two pairs attached at the extreme of the cells; a single chloroplast plate-like in shape, with two pyrenoids (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).

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D. acuatus cell 65 x 6 μm Nishi-jo-numa Hasuda Saitama, 2002	D. acuatus cell 53 x 6 μm Mihashi Park Saitama, 2002	D. acuatus cell μm O-ike park Yabuki Fukushima, 2003	D. acuatus cell μm S-M general park Showa Saitama, 2003
D. acuatus cell μm near Someino p.s. Sakura Chiba, 2008
D. acuatus ? cell 44 x 4 μm kenko-fukushi m. p. Koshigaya Saitama, 2005	Dicloster sp. or S. acuminatus ? cell 44 x 4 μm Akigase Park Saitama, 2002	Dicloster sp. cell 45 x 4 μm Saitama, 1999	Dicloster sp. cell 41 x 3 μm Saitama, 1999
Dicloster sp. cell 41 x 3 μm Koshigaya Saitama, 2001	Dicloster sp. or S. acuminatus ? cell 35 x 3 μm Saitama, 1999	Dicloster sp. cell 35 x 3 μm Kawashima or Kawajima Saitama, 2002	Dicloster sp. cell μm Kodama town Saitama, 2003
Dicloster sp. cell 50 x 2 μm Nanbata castle p. Fujimi Saitama, 2005	Dicloster sp. cell 45 x 5 μm Karasu-ga-mori p. Nasu-shiobara Tochigi, 2006

Similar genus -->> Selenastrum;

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