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The morphogenetic processes of Uronemella filificum (Kahl, 1931) Song and Wilbert①, were studied using pro-targol method. The stomatogenesis of U. filificum can be summarized as follows: membranelles 1 2, paroral membrane andscutica of the opisthe originate from the parental paroral membrane, while membranelle 3 in the opisthe develops from theparental scutica. The paroral membrane of the proter developes from the parental paroral membrane. The stomatogeneticsequences are similar to the previous descriptions for other related taxa. The phylogenetic position of Uronematidae is dis-cussed in the light of morphogenetic data obtained.