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 small, spherical or aggregates in shape; sheath inconspicuous or absent; cell body spherical in shape; chloroplasts cup-shaped or plate-like (Illustrations of the Japanese fresh-water algae, 1977).

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S. schroeteri ? μm φ Omine-numa Tsukiyono Gunma, 2003	S. schroeteri ? 7-11 μm φ Karakemi marsh Yasaka Nagano, 2005	S. schroeteri ? 8-10 μm φ Hakama marsh Madarao highland Niigata, 2005	Sphaerocystis ? 10-12 μm φ Takezono-higashi p. Tsukuba Ibaraki, 2003
Sphaerocystis ? or Apiocystis ? 10-12 μm φ Minuma n. p. Saitama, 2002	Sphaerocystis ? or Gloeocystis ? μm φ Ishinazaka Furukawa Miyagi, 2003	Sphaerocystis ? 8-11 μm φ Hakama marsh Madarao highland Niigata, 2005	Sphaerocystis ? 8 μm φ Akigase park Saitama city Saitama, 2005

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

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