Family: Colonies or unicells; planktonic or benthic; cell body spherical or ellipsoidal in shape, embedded within a gelatinous sheath; (Introduction to the Freshwater Algae, 1999).
Genus: Colonies spherical or aggregates in shape; sheath conspicuous; cell body spherical in shape; chloroplasts cup-shaped or plate-like (Illustrations of the Japanese fresh-water algae, 1977).

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G. gigas 20 x 17 μm Azami-ike Norikura highland Nagano, 2006	G. gigas μm Kareki-numa Nikko Tochigi, 2008	G. gigas 14 x 10 μm 18 μm φ Omine-numa Tsukiyono Gunma, 2003	G. gigas ? 10-20 x 25-35 μm near Yamaguchi Univ. Yamaguchi, 2004
G. gigas ? μm Mizuko Fujimi Saitama, 2003	G. gigas ? 15 x 9 μm near Yamaguchi Univ. Yamaguchi, 2004	G. gigas ? μm Kashibaru m.2 Karatsu Saga, 2006	G. gigas ? μm Kashibaru m.5 Karatsu Saga, 2006
Gloeocystis sp. ? μm Kannon-numa 11 Shimogo Fukushima, 2008
Gloeocystis sp. ? μm Numappara marsh Tochigi Tochigi, 2003	Gloeocystis sp. ? 20 x 13 μm Senuki Nasu Tochigi, 2004	Gloeocystis ? or Sphaerocystis ? 3.5-6 μm φ Koraku-en (park) Okayama, 2002	Gloeocystis ? 5-12 μm φ Kaga Ishikawa, 2000
Gloeocystis ? or Palmella ? 10-15 x 6-8 μm Ina Saitama, 2003	Gloeocystis ? col. 120 μm Tennoh Tessei-cho Okayama, 2004	Gloeocystis ? col. μm Iroha-numa Zao mountain Yamagata, 2005	Gloeocystis ? col. μm Takao-sakura p. Kitamoto Saitama, 2005
Gloeocystis ? 12 x 9 μm Tashirodaira m. Hakkoda mountain Aomori, 2005	Gloeocystis ? 16 x μm Karakemi marsh Yasaka Nagano, 2005	Gloeocystis sp. 17 x μm Watarase Wetland Fujioka Tochigi, 2005

Similar Genus -->> Sphaerocystis; Asterococcus; Chlamydomonoas; Chlorococcum;

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