Abstract: The present paper describes the morphology,infraciliature,siliverline systemand the morphogenesis of Chilodonella cyprini.There are two circumoral ciliarvrows and a preoral ciliary row on the buccal region and a dorsal row of bristles. The number of the ciliary rows on the ventral surface varies rather widely. In thelight of the development of its infraciliature and nuclei,7 morphogenetic stagesare described. The left lateral svstem of ciliary rows has divided at the same timewhile the right ciliary rows are not change. A short basal granular row forms thedorsal row of bristles of the opisthe,The proter reserves the frontal part of the oldoral basket and the oral basket of the opisthe forms renewly.Based on the results,some morphological characteristics,the mechanism of theoral basket's formation and its taxonomy are discussed.