Reconsideration of stomatogenesis in Uronema marinum Dujardin, 1841 during asexual division (Protozoa: Ciliophora: Scuticociliatida)(In English)

摘要

The stomatogenesis of the marine ciliate Uronema marinum was investigated using the protargol impregnation method. The buccal ontogeny of U. marinum can be summarized as follows: membranelles 1 and 2 of the opisthe derive from the proliferation of posterior part of parental paroral membrane; the paroral membrane and scutica of the opisthe originate from the anterior part of parental paroral membrane; while membranelle 3 of the opisthe develops from the parental scutica; the paroral membrane and scutica of proter come from the parental paroral membrane and three parental membranelles are retained during stomatogenetic process. These stomatogenetic sequences are similar to previous descriptions. The phylogenetic relationships of some taxa within the order Philasterida are discussed in the light of the morphogenetic data reported [ Acta Zoologica Sinica 50(5): 823 -827 , 2004].