Pairwise sequence identities for intra- and inter-species comparisons at the mitochondrial <i>cox-2</i> locus.

<p>Pairwise identities are plotted as box plots for a partial cytochrome oxidase 2 (<i>cox-2</i>) sequence (A) and the third codon position of the same fragment (B). Whiskers indicate 5–95% quantiles with outliers represented by dots. The mean of each dataset is marked by a cross. Intra-species comparisons and inter-species comparisons within the genus <i>Cooperia</i> are shown in black and blue, respectively. Comparisons between <i>C</i>. <i>punctata</i> and <i>C</i>. <i>spatulata</i> are drawn in red. All comparisons between a <i>Cooperia</i> sequence and a representative <i>H</i>. <i>contortus</i> sequence are plotted in green. All accession numbers for sequences used in the analysis are given in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0200390#pone.0200390.s002" target="_blank">S2 Table</a>. Index letters (a-d in panel A and a-f in panel B) are used to indicate significant differences between groups as revealed by Kruskal-Wallis test followed by a Dunn’s post hoc test between all <i>Cooperia</i> groups. Only groups sharing no index letter are significantly different (p<0.05).