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Recent studies of Rhacophorus reinwardtii in Southeast Asia split this species into five different species: R. norhayatiae, R. borneensis, R. kio, R. helenae, and R. reinwardtii. Meanwhile, the Sumatran Rhacophorus reinwardtii var. lateralis could not be ascribed to either R. norhayatiae or R. reinwardtii due to the poor condition of the specimen. Therefore, it was considered conspecific with R. norhayatiae. To identify the population of Norhayati's Gliding Frog in Sumatra, we collected a specimen of R. cf. norhayatiae and three R. cf. reinwardtii and performed phylogenetic analyses using the 16S rRNA gene using Maximum Likelihood Analysis and Bayesian Inference. The results show that the specimen of Rhacophorus cf. norhayatiae from Sumatra is grouped with R. norhayatiae from Peninsular Malaysia and the Sumatran specimens of Rhacophorus cf. reinwardtii grouped with Javan R. reinwardtii. Based on morphology, we found that the Sumatran specimen of R. norhayatiae possessed the diagnostic features of R. reinwardtii var. lateralis. However, considering the presence of the senior homonym Rhacophorus lateralis Boulenger 1883, R. reinwardtii var. lateralis is here treated as a junior synonym of R. norhayatiae. [ABSTRACT FROM AUTHOR]