Family: Minute form; naked or with sculptured shell; with a single flagellum; often with rhizopods (Kudo, 1966). Genus: Solitary; plastic or rigid; chromatophore (chloroplast) diffused or branching; with stigma; amoeboid movement (Kudo, 1966). Chromulina-like; reduced reticular parietal chloroplast; extraplastidial stimga for some species; 2 contractile vacuoles (Illustrated Guide, 1985).

20 μm 40 μm 60 μm; x 1000

C. sagene Pascher: Anterior region actively plastic; stigma small; 8-14 μm long; flagellum about 30 μm long (Kudo, 1966).