Mitochondrial genome of <i>Cossura pygodactylata</i> Jones 1956 (Annelida: Sedentaria) from the White Sea

Here, we report the complete mitochondrial genome of Cossura pygodactylata Jones 1956 (Annelida, Sedentaria, Cossuridae) (20,713 bp) comprised of two ribosomal RNAs, the ubiquitous set of 13 protein-coding genes (PCGs), 24 tRNAs, and a long AT-rich non-coding region. The order of PCGs and rRNAs is the same as in the previously reported genome of Cossura aciculata Wu & Chen 1977, but the order of tRNAs is different. Phylogenetic analysis of PCGs confirmed that Cossuridae is monophyletic and represents the sister group to Cirratulidae within Cirratuliformia.