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

Here, we report the complete mitochondrial genome of <i>Cossura pygodactylata</i> 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 <i>Cossura aciculata</i> 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.