Bellabrunetia catherinae gen. et sp. nov., the first Chinese Mesozoic isophlebioid dragonfly, is described. This fossil is the first known Isophlebioptera with well-preserved body structures, demonstrating that the fore- and hindwings are of very different size and shape in Campterophlebiidae, and that the female Campterophlebiidae had an endophytic way of oviposition, unlike the Isophlebiidae.