The ciliature microtubular organelles in the ventral cortex of Pseudourostyla nova were visualized using direct FLUTAX. The organelle consists of adoral zone of membranelles (AZM),undulating membranes (UM),frontal-midventral-transverse cirri (FVTC),left and right marginal cirri (L-and RMC) and the base-associated microtubules,etc. In the basal part of the AZM,there are membranelle brackets and associated oral rib-wall microtubules. The membranelle brackets located in the collar portion are connected with "∧" shaped microtubules. There are four types of microtubules at the base of FVTC: anterior longitudinal (ALM),posterior longitudinal (PLM),transverse (TM) and radiate microtubules (RM). These different types of microtubules differ from each other in developmental degree. The base-associated microtubules of L-and RMC contain ALM and PLM. The old cirri (e.g. frontal,transverse and marginal cirri) can persist and remain unchanged for a long time and they may disappear when they lose function. The base-associated microtubules in the ventral cortex of P.nova possess some species-independent structural characters. During the process of morphogenesis of the ciliatures,the old cirri play a role in positioning and material contribution.