Because of general phenotypic similarities and distribution of species across two continents, the genus Chiromantis has proven somewhat enigmatic. Among Indochinese species, the validity of C. hansenae has been questioned by some who consider it a junior synonym of C. vittatus. We employ three lines of evidence to elucidate the taxonomic status and phylogenetic relationships of four congeneric species of Chiromantis frogs from Thailand. Results of molecular, morphological, and bioacoustic data analyses support at least four evolutionarily distinct and monophyletic clades: C. doriae, C. nongkhorensis, C. vittatus and C. hansenae. Genetic divergence between C. vittatus and C. hansenae is > 10%, significantly greater than C. doriae and C nongkhorensis (4.5%). Our results support the taxonomic validity of C. hansenae and suggest that there may be more diversity within C. hansenae and C. vittatus than is currently recognized.
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