Fig. 2

a Ratios of non-synonymous (dN) to synonymous (dS) substitution rates estimated from individual protein-coding genes of Digramma interrupta and Ligula intestinalis. b Sliding window analysis of the alignment of complete mtDNAs of D. interrupta and L. intestinalis. The black line shows the value of nucleotide diversity in a sliding window analysis of window size 500 bp with step size 25 bp, and the value is inserted at its mid-point. Gene boundaries are indicated with a variation ratio per gene (below each gene)