Abstract: The morphology, morphogenesis of Diophrys oligothrix during the asexual division were studied in detail. Studying on the development of adoral zone of membranelles(AZM) and comparing the AZM of daughters with its parental AZM, we conclude that the AZM of the proter is reorganized. Comparing the
morphogenesis of macronuclei and the nuclear apparatus among D. oligothrix, Euplotes and Aspidisca, we can find evolutionary relation among them. After binary division, both the proter and the opisthe of D. oligothrix still recover their ciliary pattern.

Key words: morphology, morphogenesis, AZM (adoral zone of membranelles), Diophrys oligothrix, morphology, morphogenesis, AZM (adoral zone of membranelles)