Micryletta inornata is a complex species that is widely distributed from Sumatra to mainland Asia, including the Thai-Malay Peninsula and Indochina. Recently, this species was confirmed to be endemic to regions near the type locality in Sumatra, and the populations from other regions were suggested to be different species. We examined phenotypic and genotypic characters of the Sumatran populations and found an unnamed lineage in addition to the true M. inornata. The newly found lineage can be distinguished from M. inornata and other congeners by both molecular and morphological traits and has been named Micryletta sumatrana sp. nov. The new species is characterized by having a small body size, golden brown dorsum with scattered dark spots, dark brown ventrum with diffuse cream mottling, dark brown lateral head with cream spots on lips and the tympanum region extending to the axilla, and tibiotarsal articulation reaching to the front of the eye. We discuss the taxonomic status of so-called M. inornata occurring outside of its type locality, especially of M. inornata lineata.
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Vol. 37 • No. 3