# Partial mitochondrial genome of the enigmatic Bermuda fireworm Odontosyllis enopla Verrill, 1900 (Annelida, Syllidae, Eusyllinae) and its phylogenetic implications

## TL;DR

This paper reports the partial mitochondrial genome of the Bermuda fireworm and explores its evolutionary relationships.

## Contribution

The study provides the first extensive partial mitogenome of Odontosyllis enopla and analyzes its phylogenetic placement.

## Key findings

- A 10,172 bp partial mitochondrial genome was assembled, including nine protein-coding genes and two rRNAs.
- Intraspecific variation was analyzed among three female O. enopla mitogenomes.
- A putative location for the mitochondrial origin of replication was proposed using DNA Walker analysis.

## Abstract

The Bermuda fireworm, Odontosyllis
enopla Verrill, 1900, is a marine polychaete that displays a unique bioluminescent mating ritual. Despite the first sighting of O.
enopla more than 534 years ago, molecular data have been limited. Several syllid mitogenomes are currently available; however, there are only three published genes for O.
enopla: two partial mitochondrial genes (16S [508 bp] and cox1 [653 bp]; 1,161 bp total) and one partial nuclear gene (18S [1,339 bp]). This study bioinformatically mined previously published transcriptomes of O.
enopla for mitochondrial reads and subsequently assembled and annotated a partial mitochondrial genome (10,172 bp). The partial mitogenome includes nine (of 13) protein-coding genes, two ribosomal RNAs, and seven (of 22) complete tRNAs. We place the Bermuda fireworm in phylogenetic context using all available syllid mitogenomes, analyze intraspecific variation among three female O.
enopla partial mitogenomes, and propose a putative location for the mitochondrial origin of replication using a DNA Walker analysis.