Best tree from maximum likelihood analysis (RAxML, mtRev+G+I) with the 30 taxa dataset (concatenated amino acid alignments). Numbers indicate bootstrap percentage (RAxML, mtRev+G+I). Thick lines for clades indicate bootstrap support of at least 85%. Dotted lines depict taxa appearing as polyphyletic in our analysis. Scale bar depicts substitutions per site. For complete species names and accession numbers of GenBank entries see [Additional file 1]. Asterisks indicate taxa with incomplete mt genome records.