The structure of cells of the predatory flagellates Colpodella pseudoedax and C. unguis was studied. The cell was found to contain two heterodynamic flagellae, three-membrane pellicle, micropores, subpellicular microtubulae, microtubular open conoid, roptries, micronemes, extrusive organelles (trichocysts), and mitochondria with tubular cristae. Upon discharging, trichocysts form cross-striated bands. The thin-walled cylinder lies in the transitional zone of the flagellae. Cells reproduce by means of longitudinal binary fission. The similarities between given species and other colpodelids and such between perkinsea, sporozoans, and dinoflagellates are discussed.
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