First mitochondrial genomes of Capitellidae and Opheliidae (Annelida) and their phylogenetic placement

The complete mitochondrial genomes of Notomastus sp. (15,776 bp) (Annelida: Capitellidae) and Armandia sp. (18,538 bp) (Annelida: Opheliidae) were assembled for the first time. A group II intron (303 bp) was found in cox1 of Notomastus sp. A phylogenetic analysis revealed that Notomastus sp. and Armandia sp. were monophyletic, and this clade was clustered with echiurans, although the possibility of the effect of long-branch attraction should be considered.

Automated summary

The complete mitochondrial genomes of Notomastus sp. and Armandia sp. were assembled for the first time. A group II intron was found in the cox1 gene of Notomastus sp. Phylogenetic analysis revealed that Notomastus sp. and Armandia sp. were monophyletic and clustered with echiurans, although the possibility of long-branch attraction should be considered.