A new species in the dicroglossid frog genus is described from Ko Pha-ngan, Ko Samui, and Ko Lanta Yai Islands in southern Thailand. Males of . lack a caruncle on top of the head and very closely resemble (Boulenger, 1887) from Myanmar and western and southern Thailand. However, the new species is distinguished from and its congeners using an integrative taxonomic approach of morphology, mitochondrial DNA, and bioacoustics. . differs from and its congeners by having a unique combination of morphological characters, including body size; skin texture of the interorbital region, dorsum, and shank; toe webbing; relative size of the inner metatarsal tubercle; and coloration of the tympanum, venter, and ova. The advertisement call of the new species is also readily differentiated from that of in temporal parameters. . is highly divergent in mitochondrial DNA from and its congeners, but its phylogenetic position within the genus is not resolved. The natural history of the new species is presented, and the geographic range of in Thailand is clarified.
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