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Not AvailableZeugodacus caudatus (Fabricius) is a pest of cucurbit plants. The present study was conducted to draw the relationship among Indian Z. caudatus populations with the other defined genetic lineage of the species. A total of 18 individuals’ mtCOI gene sequences from 3 populations of India were analysed along with 34 individuals’ mtCOI gene sequences from Malaysia, Indonesia, Thailand and China and generated 14 haplotypes. Phylogenetic study revealed the presence of distinct genetic lineage in Z. caudatus populations collected from India. The genetic distance between three distinct lineages of Z. caudatus was 0.057, 0.055 and 0.018 between Indonesia and Malaysia, India and Indonesia, and India and Malaysia, respectively and also evident from phylogenetic analysis. Further, the mitochondrial cytochrome oxidase I (COI) gene sequences developed in this study will help detection and geographical distribution of new haplotypes and lineages of the species in future.Not Availabl