Complete mitochondrial genome sequences and phylogenetic relationship of <i>Elysia ornata</i> (Swainson, 1840) (Mollusca, Gastropoda, Heterobranchia, Sacoglossa)

Abstract

The sacoglossans are small sea slugs in the Heterobranchia. In this study, mitochondrial genome of a sacoglossan sea slug, <i>Elysia ornata</i> (Swainson, 1840) is analyzed and phylogenetic tree of the species in the Heterobranchia is reconstructed based on amino acid sequences of mitochondrial protein coding genes. The phylogenetic relationship analysis shows that <i>E. ornata</i> belongs to the monophyletic Sacoglossa in the Heterobranchia and the Sacoglossa shows sister group relationship with a lineage including Anaspidea and Siphonarioidea. This is the fourth record for the mitochondrial genome of sacoglossan sea slugs.