What question did this study set out to answer?

To report the complete mitochondrial genome of Cossura pygodactylata and analyze its phylogenetic implications.

May 15, 2026Open Access

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

MEMargarita EzhovaMoscow State University ABAleksandra BezmenovaMoscow State University ВЕВ А ЕмельяненкоOkinawa Institute of Science and Technology Graduate University

Key Points

To report the complete mitochondrial genome of Cossura pygodactylata and analyze its phylogenetic implications.
Sequencing of the mitochondrial genome, totaling 20,713 base pairs.
Identification of two ribosomal RNAs, 13 protein-coding genes, and 24 tRNAs along with a non-coding region.
Phylogenetic analysis using protein-coding genes to ascertain relationships within Annelida.
Confirmed monophyly of Cossuridae based on phylogenetic analysis.
Identified differences in the order of tRNAs when compared to Cossura aciculata's genome.
Demonstrated that Cossuridae is the sister group to Cirratulidae within Cirratuliformia.

Abstract

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.

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