﻿AbstractAn integrative taxonomic analysis was used to delimit and diagnose a new species of theCyrtodactylusbrevipalmatusgroup from Tak Province in western Thailand. Although Bayesian phylogenetic analyses placeC.denticulatussp. nov.within thebrevipalmatusgroup, the new species is neither nested within nor is it the sister species of any other species in thebrevipalmatusgroup. Furthermore, based on the mitochondrial NADH dehydrogenase subunit 2 gene (ND2) and adjacent tRNAs, it bears an uncorrected pairwise sequence divergence of 7.87–21.94% from all other species in thebrevipalmatusgroup.Cyrtodactylusdenticulatussp. nov.is differetiated from all other species in thebrevipalmatusgroup by having a number of unique charateristics such as denticulate ventrolateral body folds and ventrolateral subcaudal ridges, characters not seen in any other species of the group (n= 51 individuals). Additionally, based on a multiple factor anlaysis,C.denticulatussp. nov.does not overlap with any other species in multivariate space. The discovery ofC.denticulatussp. nov.underscores the unrealized diversity of upland ecosystems across Thailand and the urgent need for increased exploration and conservation of these unique imperiled montane refugia, especially in this era of climate change.