Characterization and phylogenetic analysis of the complete mitochondrial genome of the marine ribbon worm Cephalothrix species (nemertea: Palaeonemertea)

摘要

Here, we report the complete mitochondrial genome of the marine nemertean Cephalothrix species collected from the coastal region of South Korea. The mitochondrial genome of Cephalothrix sp. South Korea (SK) stain is 16,396?bp contains 13 protein-coding genes (PCGs) along with 22 transfer RNA (tRNA) genes, two ribosomal RNA (rRNA) genes, and an AT-rich noncoding region, arranged identically to those of Palaeonemertea. The nucleotide composition in the Cephalothrix sp. (SK) mitogenome is highly biased toward A and T as total AT content is 76.3% across the genome. A phylogenetic analysis of Nemertean species indicates that Cephalothrix sp. (SK) mitogenome shows close relationships to those of Palaeonemertea (Cephalothrix sp. and C. hongkongiensis collected from China).