A new species of Rana (Amphibia, Anura, Ranidae) from Hainan, Southern China

A new species of the genus Rana is described from Hainan Island, southern China, based on morphological and molecular evidence. During herpetological surveys conducted in Wanning City and Mt. Diaoluo, Hainan Province, a series of Rana specimens assignable to the R. johnsi group were collected from montane tropical rainforest habitats. Phylogenetic analyses based on mitochondrial 16S, COI, and cyt b sequences recovered the Hainan population as a distinct and well-supported lineage within the R. johnsi group. Morphometric analyses, including PCA, DAPC, and PERMANOVA, further demonstrated significant differentiation between the Hainan population and its congeners. The new species, Rana hainan Wang, Qiu, Song, Qi, Wang, Li & Wang, sp. nov ., is characterized by a medium body size, head longer than wide, a distinct triangular black patch on the temporal region, straight and narrow dorsolateral folds, toe tips with connected lateroventral grooves, absence of tarsal folds, and breeding males possessing a continuous grayish-white nuptial pad on finger I. Historical records of R. varians , R. nigrotympanica , and R. johnsi from Hainan are reviewed. Records from Mt. Diaoluo are reassigned to the new species, whereas records from other localities are conservatively treated as Rana cf. johnsi pending further investigation.