Plots of A+C and G+T composition along the "+" strand of the mt genomes of D. maximum, D. gregarium, E. tulipa, and T. squamigerus using a sliding window of 100 nucleotides. Each plot is positioned above a linear representation of its corresponding genome highlighting regions corresponding to the presence of: 1) protein encoding genes and tRNA genes encoded on the "+" strand, 2) rRNA genes encoded on the "+" strand, and 3) tRNA genes encoded on the "-" strand. See  for a comparison with Nautilus and Katharina. As is the standard convention for metazoan mt genomes, cox1 has been designated the start point for the "+" strand.
Rawlings et al. BMC Genomics 2010 11:440 doi:10.1186/1471-2164-11-440