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Comparison of mitochondrial gene order in Stolidobranchia. The gene orders in the mitochondrial genomes of the two stolidobranchs Halocynthia roretzi and the newly-obtained Herdmania momus are compared. To illustrate the extent of the gene order rearrangements, the same protein-coding genes are connected by black rectangles between the two stolidobranchian mitochondrial genomes. The only syntenic region between the two related genomes represented by a single gene pair, including tRNA-Trp - tRNA-Ile, is indicated by two connected white rectangles.