The Mitochondrial Genomes of and (Annelida: Siboglinidae) and Their Phylogenetic Analysis.

Frenulates are a group of sedentary Annelida within the family Siboglinidae that inhabit the ocean floor and present a unique challenge for comprehensive molecular and phylogenetic investigations. In this study, we focused on the frenulates, specifically assembling the mitochondrial genomes of and . The phylogenetic reconstruction placed as a sister taxon to , and as a sister taxon to , supporting the non-monophyletic nature of the genus . Overall, this study supports the phylogeny of the family Siboglinidae while highlighting the need for additional molecular data within frenulates.