Family: Unicells; cell wall present; two flagella (Illustrations of The Japanese Fresh-water Algae, 1977).
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. callosa, C. costata ? C. dalecarlica, C. debaryana, C. fimbriata ?, C. globosa, C. heterogama ?, C. incerta, C. latifrons ? C. multitaeniata ?, C. nasuta, C. proboscigera, C. reinhardtii, C. simplex ?, C. splendida, C. steinii ?, C. thiophila ?, C. zebra ?,

Bicocca:
	C. bicocca, C. inaequalis,

Chlamydella: Chloroplast cup-shaped; pyrenoid central lateral; nucleus anterior-posterior
	C. hallensis, C. moewusii, C. monadina, C. parvula, C. peterfii,

Chlorogoniella: Chloroplast lateral; pyrenoid central lateral; nucleus anterior-posterior
	C. acuta, C. aplanata ?, C. asymmetrica, C. baca ?, C. botryopara ??, C. fiscina ?, C. geitleri, C. kakosmos ?, C. proteus ?, C. oligochloris C. rhinoceros, C. sagittula ?,

Pseudagloë: Chloroplast centrally located, concaved at both ends; pyrenoid central; nucleus anterior
	C. biciliata ?, C. christensenii ?, C. mutabilis,

Agloë: Chloroplast centrally located, concaved at both ends; pyrenoid central; nucleus posterior
	C. regularis ?, C. sp.

Pleiochloris: Chloroplast cup-shaped; pyrenoids many; nucleus anterior
	C. capensis, C. deasonii, C. sp.,

Amphichloris: Nucleus centrally located in between two pyrenoids
	C. pseudopertusa,

Similar genus -> Chloromonas; Chlorococcum;

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