Figure 1

Gene map of the Xenoturbella bocki mitochondrial genome compared to other deuterostome mitochondrial genomes. Xenoturbella bocki gene order is compared to Balanoglossus carnosus and Saccoglossus kowalevskii (two hemichordates), Homo sapiens, Branchiostoma floridae (a cephalochordate) and Gymnocrinus richeri (a crinoid echinoderm). Below: Mitochondrial gene order reconstruction for the deuterostome common ancestor. *Position of the control region is uncertain. The most parsimonious scenario for the ancestral deuterostome was reconstructed using gene order information from species in the echinoderm, hemichordate, Xenoturbella, vertebrate and cephalochordate lineages. The urochordate lineage was too derived.