The Mitochondrial Genomes of Siboglinum plumosum and Oligobrachia dogieli (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 Siboglinum plumosum and Oligobrachia dogieli . The phylogenetic reconstruction placed S. plumosum as a sister taxon to S. ekmani , and O. dogieli as a sister taxon to S. fiordicum , supporting the non-monophyletic nature of the genus Siboglinum . Overall, this study supports the phylogeny of the family Siboglinidae while highlighting the need for additional molecular data within frenulates.