| Summary: | To date, only five species are registered in the genus Hediste, and complete mitochondrial genome is reported in one species, Hediste diadroma. In this study, a complete 15,783 bp genome for the marine polychaete H. japonica mitochondrion was assembled through Illumina HiSeq platform. The complete mitochondrial genome of H. japonica contained 13 protein-coding genes (PCGs), 22 transfer RNA (tRNA) genes, two ribosomal RNA (rRNA) genes, and one control region. Overall genomic structure and gene orientation of H. japonica mitogenome are identical to those of H. diadroma. Phylogenetic analysis using the maximum likelihood method validated the sister relationship between Hediste sp. and other polychaetes. This information will be useful to understand geographical distribution, phylogenetic relationship, and evolutionary history of marine polychates.
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