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Description of Pirsonia guinardiaeFlagellates laterally flattened, about 10 microns long and 6 microns wide. Auxosome remains flagellated. Mature auxosomes apple-shaped, about 15 microns in diameter, generally detaching before division, giving rise to 4 (to 8) daughter cells which are infectious without a longer resting phase. Thick-walled cysts present.