Family: Unicells or colonies of non-fixed number of cells; cell body variable in shape; one or more chloroplasts variable in shape; asexual reproduction by autospore or autocoenobium (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Planktonic; colony of 2-8 cells surrounded by cell wall of their mother cell, but sometimes unicellular; cell body broad ellipsoidal, both ends slightly pointed and with a thick cell wall; 1-3 chloroplasts parietal plate-like, with a single pyrenoid (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).

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Oocystis sp. 77 x 42 μm near City Hall Fujimi Saitama, 2004	Oocystis sp. 68 x 34 μm 58 x 26 μm Tsukamoto Sakura-ku Saitama, 2004	Oocystis sp. 63 x 29 μm L/W=2.2 rice field Ichinoseki Iwate, 2005	Oocystis sp. or Eremosphaera ? 70 x 57 μm Shuku Saitama, 2004
Cell body nearly spherical or broad ellipsoidal
Oocystis sp.6 ? 19 x 16 μm Fukasaku-gawa y. Saitama, 2002	Oocystis sp.6 ? 16 x 12 μm Kinchakuda Hidaka Saitama, 2004	Oocystis sp.6 16 x 12 μm Aquatic botanical g. Sawara Chiba, 2004	Oocystis sp.1 ? 13 x 10 μm Shirahata-numa Musashi-Urawa Saitama, 2001
Oocystis sp. ? 13 x 9.5 μm Nasu Tochigi, 2001	Oocystis sp. ?? μm Miyadera Iruma Saitama, 2005	Oocystis sp. ? or Gloeocystis ? 10 x 8 μm Kayoicho-ike Fukuoka, 2001	O. borgei ? 20-33 x 10-20 μm Aquatic botanical g. Sawara Chiba, 2004
Cell body foot-ball shaped
O. marssonii 13 samples 12-19 x 8-13 μm L/W=1.5-1.9 2001-2008	Oocystis sp. O.lacustris ?? 3 samples 19-24 x 10 μm L/W=2.0 2004-2006	Oocystis sp. 10 x 6 μm Inari Park Toyama, 2002	Oocystis sp. 10 x 7 μm near Town Hall Shobu Saitama, 2004
Oocystis sp. μm Kijioka Castle Ruin Kodama Saitama, 2003	Oocystis sp.3 ? or Nephrocytium ? 9 x 6 μm Abiko Chiba, 2000	Oocystis sp.3 ? or Nephrocytium ? 9 x 6 μm Fukui, 2000	Oocystis sp. ? 20 x 10 μm Tanohara Natural p. Ontake highland Nagano, 2005
Cell body elongated ellipsoidal
Oocystis sp. ? 27 x 12 μm riverside park Abukuma river Fukushima, 2005	O. ecballocystiformis 11 samples 8-23 x 4-9 μm 2001-2006	Oocystis sp.2 ? 14 x 8 μm Koshigaya Saitama, 2001	Oocystis sp.2 ? 11-12 x 6 μm Toyohashi railway st. Toyohashi Aichi, 2004

Similar genus -->> Nephrocytium;

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