A new species of damesellid trilobite, Bergeronites leishuae n. sp., is described from the Fulu Biota in the Longha Formation (Cambrian, Guzhangian), southeastern Yunnan Province, South China. Bergeronites leishuae is common in the Fulu Lagerstatte and represented by both disarticulated sclerites and the first complete exoskeletons recorded for the genus. Together, these remains allow for a more thorough understanding of the morphology of this distinctive trilobite genus, both dorsally and ventrally. The new material also allows for further differential comparisons with other species previously assigned to Bergeronites. Specimens showing the ventral cephalic morphology reveal the presence of a short connective suture immediately flanking the sagittal line of the doublure, and a thin, ridge-like rostral plate. They also show the hypostome to be in conterminant condition. Ontogenetic material of B. leishuae is known from meraspid degree 6 through the holaspid stage; it includes the first meraspid-stage specimens known for Bergeronites. As presently known, the geographic distribution of Bergeronites is restricted to the East Asian sector of Gondwana (North China, South China, and Vietnam). (c) 2025 Elsevier B.V. and Nanjing Institute of Geology and Palaeontology, CAS. All rights are reserved, including those for text and data mining, AI training, and similar technologies.