Family: Unicells or cell aggregates cubic or irregular in shape; cell body without hairly projections (Introduction to the Freshwater Algae, 1999).
Genus: (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).

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Tetracystis sp. stock Ikk-21 cell 7-15 μm φ Kaga Ishikawa, 2000	Tetracystis sp. stock Twa-1 cell 6-12 μm φ Watarase Tochigi, 2001	Tetracystis sp. stock Twa-1 cell 8-20 μm φ Watarase Tochigi, 2001	Tetracystis sp. cell 8 μm φ Kasuga Fukuoka, 2001
T. schmidlei ? or Gloeosphearidium ? cell 4-7 μm φ Niigata, 2001	T. schmidlei ? or Gloeosphearidium ? cell 4-8 μm φ Toneri Park Tokyo, 2001	Tetracystis ? or Gloeocystis ? cell 4-8 μm φ Tsukuba Ibaraki, 2002

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