Genus: Two flagella of equal length inserted close together into an anterior papilla of variable shape usually directed anteriorly; chloroplast form variable; usually 2 contractile vacuoles; cell division producing 2-8 zoospores; sexual reproduction usually isogamous, anisogamy and oogamy known but rare; > 500 species, mostly fresh water (Illustrated Guide, 1985). A large chloroplast; stigma; a single nucleus; two contractile vacuoles anterior (Kudo, 1966).

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Euchlamydomonas: Chloroplast cup-shaped; pyrenoid posterior; nucleus anterior
C. reinhardtii 21 samples 9-18 μm papilla absent s: equatorial 2000-2005	C. incerta 5 samples 7-13 μm φ papilla absent 2000-2002	C. microsphaerella 3 samples 9-12 μm φ papilla absent Kawagoe 2001-2003	C. latifrons ? 14-22 x 10-19 μm papilla absent Takasaki park Takasaki Gunma, 2004
C. heterogama 4 samples 18-27 μm φ papilla present 2003-2004	C. saxonensis ? 15-22 x 7-18 μm φ papilla present Japan, 2004	C. simplex ? 3 samples 11-14 μm papilla present 2002-2004	C. debaryana ? 15-17 x 10-13 μm papilla present Akigase park Saitama Saitama, 2005
C. thiophila ? 12-15 μm φ papilla present Otto-Numa Tsuchiura Ibaraki, 2002	C. proboscigera 13-14 μm papilla present Kodaira Central p. Tokyo, 2003	C. splendida ? 2 samples 14-16 x 12-13 μm papilla dichotomous 2001-2004	C. callosa 2 samples 15-21 x μm papilla present Saitama, 2006
Chlamydomonas ? μm stg: xxxx Tsuchiura Ibaraki, 2003	C. fimbriata ? 23 x 13 μm papilla present Kaga Ishikawa, 2000	Chlamydomonas sp. 10 x 6.5 μm Ranzan Saitama, 2004	Chlamydomonas sp. 13 μm Todoroki green l. Kawasaki Kanawaga, 2004
Chlamydomonas sp. 7.5-10 x 5-10 μm Iruma river Sayama Saitama, 2004
Chloroplast longitudinally incised (or striated)
C. nasuta 2 samples 8-23 x μm Gyoda Saitama, 2006	C. dalecarlica ? 26 x 20 μm pyr. at center Tama river Chofu Tokyo, 2004	C. dalecarlica ? μm pyr. at center Higashi-sano Hakuba Nagano, 2004	C. multitaeniata ? 4 samples 20-25 x 15-19 μm chl. incised Japan, 2005
C. steinii ? 2 samples 18-22 x 13-15 μm chl. incised Japan, 2004	Chlamydomonas sp. ? 16 x 12 μm Kata-numa Narugo Miyagi, 2003	Chlamydomonas sp. ? 11 x 7 μm Kata-numa Narugo Miyagi, 2006	Chlamydomonas ? 16 x 12 μm Kawanago Ishibashi Tochigi, 2004
C. costata ? 14-17 x 10-12 μm Ikenokochi marsh Tsuruga Fukui, 2004	C. zebra ? 14 x 13 μm Asa-kawa Hachioji Tokyo, 2005
C. globosa 9 x 6.5 μm Kurome river Asaka Saitama, 2004	C. globosa 8 x 6 μm Karakemi marsh Yasaka Nagano, 2005	Chlamydomonas sp. 12 x 10.5 μm Hanasaki water p. Kazo Saitama, 2005	Chlamydomonas sp. cell μm Japan, 199?

Similar genus -> Chloromonas; Chlorococcum;

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