At telophase, nuclei reform, chromosomes decondense, and spindle microtubules disappear. A cleavage furrow is initiated between the basal body pairs and progresses posteriorly until the cells are separated. The reforming microtubular roots are visible just behind the leading edge of the cleavage furrow. This cell becomes the zoospore and swims away. The progeny cell that receives the parent cell's posterior flagellum remains in the parent lorica.
Cysts form, as far as is known, from single trophic cells.
Their prevalence and role in nature is unknown. In culture, they remain viable for several months, germinating upon a change in culture medium upon the appearance of fresh food bacteria.