Figure 2.

Nucleotide divergence and amino acid replacements in mitochondrial genes between S. indicum and S. spindale, and isolates of S. spindale. Where (a) is nucleotide divergence based on pairwise genetic distance calculated as the average number of nucleotide substitutions per site (Dxy) with blocked areas highlighting the species identification cox1 gene and the ribosomal genes used in population genetic studies. (b) is the proportion of amino acid differences calculated as the total number of replacements within each protein sequence divided by the protein length. The oxidative phosphorylation system complex (Cx) is highlighted.