Fig. 2

Comparison within- and among-species max-min genetic distances across mitochondrial protein-coding, nuclear ribosomal, and nuclear protein-coding genes (a total of 7 loci). Nucleotide distances (K2P) are contrasted with uncorrected amino acid distances (multiplied by 3 to be in the same scale). Nucleotide distances of putative species (OTUs) having no clear morphological boundaries are shown in gray, while OTUs with clear morphological species are shown in red (within-species) or green (among-species distances). Threshold in nucleotide K2P distances between these two groups of OTUs is shown by a horizontal line. Within-species distances are given only for the three taxa where sufficient numbers of individuals were sequenced and genetic variation was detected: Dermatophagoides farinae, D. pteronyssinus and Psoroptis ovis