Maximum parsimony network and corresponding nested design for cytochrome b haplotypes observed in 17 populations of Chioglossa lusitanica. Note that the numbers are given without the ‘h’ prefix. Hypothetical haplotypes are represented by ‘o’. Thinlined polygons enclosed 1-step clades and are designated by ‘1-n’; thick-lined polygons enclosed 2-step clades ‘2-n’); the thick lineseparates 3-step clades (3-1 and 3-2).