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: Planktonic; unicellular or colony of 4, 8, or 16 cells; both cells and its colony covered with layers of mucous sheath; cell body spherical; cell wall smooth; a single chloroplast star-shaped, with a pyrenoid located at the center (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).

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A. superbus 12-24 x 11-21 μm Showa Memorial p. Tokyo, 2001	A. superbus 10-20 x 7-17 μm Maruyama Park Saitama, 2002	A. superbus 24 x 21 μm 13 x 10 μm Toneri Park Tokyo, 2001	A. superbus ? 15-17 x 12-15 μm Kosugi Toyama, 2002
A. superbus ? 10 x 8 μm near City Hall Fujimi Saitama, 2004	A. superbus ? 12 x 7 μm near Town Hall Shobu Saitama, 2004	A. superbus ? 14-23 μm Yamaguchi university Yamaguchi, 2004
A. superbus ? 20-24 μm Komado marsh Showa & Tajima Fukushima, 2004	A. superbus ? μm Miyatoko m Minami-Aizu Fukushima, 2008	A. superbus ? μm Water reservoir Nabekura h.l. Nagano, 2008	A. superbus ? μm Ryugahara m. Yuri-Honjo Akita, 2008
Asterococcus sp. ? 11-15 x 8-13 μm Watarase-Yusuichi Tochigi, 2001	Asterococcus ? or Chlamydomonas ? 15 x 12 μm Akigase Park Saitama, 2002	Asterococcus ? μm Iruma Saitama, 2003	Asterococcus ? μm Lake Biwa Maihara Shiga, 2003
Asterococcus sp. μm Omine-numa Tsukiyono Gunma, 2003	Asterococcus sp. μm Naruto Chiba, 2003	Asterococcus sp. μm Ina Saitama, 2003	Asterococcus sp. 14-18 μm Tanohara Natural p. Ontake highland Nagano, 2005
Asterococcus sp. 23 μm Iroha-numa Zao mountain Yamagata, 2006

Similar Genus -->> Chlamydomonoas; Chlorococcum; Chlamydocapsa;

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