Characterization and phylogenetic analysis of the complete mitochondrial genome of the polychaete, .

In this study, we report the complete mitogenome sequence of the polychaete, (Sars, 1851). The circular mitochondrial genome is 15,696 bp in length and has an AT content of 66%. As in other polychaetes, the genome has 13 protein-coding genes (PCGs), two ribosomal RNA (rRNA) genes, 22 transfer RNA (tRNA) genes, and a non-coding region. Gene composition and their order in the mitochondrion are identical to the Terebelliformia mitogenomes. A maximum-likelihood gene tree based on the mitogenome combined with previously published Sedentaria and Errantia mitogenomes revealed that forms a clade with two Terebelliformia species.