# The complete mitochondrial genome of a marine polychaete, Ophryotrocha xiamenensis (Annelida: Dorvilleidae)

## TL;DR

This paper reports the full mitochondrial genome of a marine worm, Ophryotrocha xiamenensis, and its placement in a genetic group.

## Contribution

The study provides the first complete mitochondrial genome for Ophryotrocha xiamenensis and clarifies its phylogenetic position.

## Key findings

- The mitochondrial genome is 16,111 bp long with 13 protein-coding genes, 22 tRNA genes, 2 rRNA genes, and a noncoding region.
- Phylogenetic analysis places O. xiamenensis in the 'labronica' clade with gene order matching O. japonica.
- The study enhances genetic resources and phylogenetic understanding within the genus Ophryotrocha.

## Abstract

Ophryotrocha xiamenensis is an appropriate model for investigating regeneration and evolution. The complete mitochondrial genome is 16,111 bp in length and consists of 13 protein-coding genes (PCGs), 22 transfer RNA genes, 2 ribosomal RNA genes and a noncoding region. Phylogenetic analysis based on concatenated sequences of all 13 PCGs using the maximum-likelihood and Bayesian methods, placed O. xiamenensis within the ‘labronica’ clade and the order of gene arrangement was the same as that of O. japonica. This study contributes to the development of genetic resources and advances the understanding of phylogenetic resolution within the genus Ophryotrocha.