The microfossils described and illustrated in this paper were discovered in black cherts of the Shibantan Member of the upper Sinian Dengying Formation in the Yangtze Gorges, western Hubei. All of the microfossils were observed in petrographic thin-sections, including 10 genera, 5 species and 5 undeterminate species (including a new genus). The Shibantan Member, which consists of black, thin-bedded limestone, is famous for containing abundant megascopic algal fossils Vendotaenia and Tyrasotaenia, and the infrequent metazoan fossil Parachania. The cherts in-terbedded in thin-bedded limestone contain not only fragments of the two megascopic algal morphs but also some microfossils dominated by ? Leiothrichoides sp. and Primoflagella speciosa Gnilovskaya. Priinoflagella speciosa was originally discovered in the Kotlin Formation (Valdai series, Vendian System) on the East European Platform and it is first found in China. The discovery of the assemblage provides important evidence for the stratigraphical correlation and further enriches the Sinian paleontologic data in China.