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

The Bermuda fireworm, <i>Odontosyllis enopla</i> Verrill, 1900, is a marine polychaete that displays a unique bioluminescent mating ritual. Despite the first sighting of <i>O. enopla</i> more than 534 years ago, molecular data have been limited. Several syllid mitogenomes are currently available; however, there are only three published genes for <i>O. enopla</i>: two partial mitochondrial genes (16S [508 bp] and <i>cox1</i> [653 bp]; 1,161 bp total) and one partial nuclear gene (18S [1,339 bp]). This study bioinformatically mined previously published transcriptomes of <i>O. enopla</i> 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 <i>O. enopla</i> partial mitogenomes, and propose a putative location for the mitochondrial origin of replication using a DNA Walker analysis.