The complete mitogenome dataset of the heptageniid mayfly (Ephemeroptera: Heptageniidae: Ecdyonurinae) from South Korea.

The Heptageniidae family stands out as one of the most abundant and widespread among mayflies, distinguished by its unique mitochondrial characteristics in intergenic spacers and duplication of transfer RNA (tRNA) genes. In this dataset, we present the complete mitochondrial genome sequence of (Navás, 1912), a member of the Heptageniidae family of mayflies. The total length of the mitogenome was determined to be 15,362 base pairs, encompassing 13 protein-coding genes (PCGs), 23 tRNA genes, and two ribosomal RNA genes. An additional gene was detected in the genome, consistent with observations in other Heptageniid species. The base composition of the mitogenome was determined to be 31.7 % A, 32.7 % T, 14.1% G, and 21.5 % C. Phylogenetic analysis using PCGs confirmed that the newly sequenced mitogenome clusters within the genus , showing closer proximity to that of .