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). Species: Cell body spherical in shape, 10-20 μm in diam., papilla absent, cell wall thickened, flagella 1.5 times longer than the cell body, chloroplast filled cell body,

31 μm 63 μm 94 μm; x 640