Family: Colonial, usually with a gelatinous coat; 4 daughter cells are connected with filaments derived from their maternal cell wall; cell body spherical, elliptical or heart-shaped; a single chloroplast plate-like or cup-shaped containing a pyrenoid; asexual reproduction by autospore, sexual reproduction by fertilization of egg and sperm.
Genus: Planktonic; colony of 16 (or more) cells within a thin gelatinous sheath; cell body sickle-shaped, connected with each other by gelatinous filaments and arranged at the periphery of the sheath; a single chloroplast plate-like, with a pyrenoid (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).

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Selenodictyum sp.2 cell 25 x 6 μm Tane-ike Togakushi highland Nagano, 2005	Selenodictyum sp.2 cell 23 x 7 μm Abiko Chiba, 2000	Selenodictyum sp.2 cell μm Kodama town Saitama,2003	Selenodictyum sp.2 cell 16 x 2 μm Nasu Tochigi, 2001
Selenodictyum sp.2 cell μm Chiba-Minato Park Chiba, 2003	Selenodictyum sp.1 cell 13 x 4 μm Ueno Tokyo, 2001
Selenodictyum sp.3 cell 10 x 1.5 μm Ueno Tokyo, 2001	Selenodictyum sp.3 cell 18 x 2 μm Fukada Park Sanda Hyogo, 2001	Selenodictyum sp.3 stock Hsf-39 cell 18 x 2 μm Fukada Park Sanda Hyogo, 2001	Selenodictyum sp.3 stock Hsf-41 cell μm Fukada Park Sanda Hyogo, 2001
Selenodictyum sp.3 Fukada Park Otto-Numa Ibaraki, 2002	Selenodictyum sp.3 Fukada Park Kawashima or Kawajima Saitama, 2002	Selenodictyum sp.3 Fukada Park Otto-Numa Tsuchiura Ibaraki, 2002	Selenodictyum sp.3 Fukada Park Chiba-Minato Park Chiba, 2003

Similar Genus -->> Selenastrum; Kirchneriella

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