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Here, we report the complete mitogenome information of the terebellid polychaete, Thelepus plagiostoma (Schmarda, 1861). Genome sequencing by Illumina HiSeq platform permitted assembly of a circular mitochondrial genome of 15,628 bp from T. plagiostoma consisting of 67% AT nucleotides, 13 protein-coding genes (PCGs), 2 ribosomal RNA (rRNA) genes, 22 transfer RNA (tRNA) genes, and a non-coding region in the typical annelid gene composition. Gene order of the T. plagiostoma mitochondrion is identical to those of the Terebelliformia mitogenomes. Phylogenetic reconstruction places T. plagiostoma within the monophyletic subclass Sedentaria, a sister to Pista cristata in the suborder Terebelliformia.