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Description of ChrysonepheleCells arranged peripherally in large gelatinous colonies that are free-floating or attached to macrophytes; cells naked, Ochromonas-like, with 2 vigorously heterodynamic flagella (cells and colonies are non-motile, however); short flagellum with a flagellar swelling (photoreceptor), lying in juxtaposition to the eyespot which is located in a lobe of the chloroplast; long flagellum also containing dense material within the flagellar membrane on the side facing the short flagellum; nutrition both phototrophic and phagotrophic; free-swimming stages, reproduction and stomatocysts not known; monotypic genus, so far only observed in an ephemeral swamp in Tasmania. See Pipes et al. (1989). For 18S rRNA gene sequence data see Saunders et al. (1997a).