Fig. 4

Unrooted neighbour-joining (NJ) evolutionary tree based on pairwise DA distances among Fascioloides magna from Europe (EU) and North America (NA). a Tree representing F. magna from NA enzootic regions and EU natural foci. b Tree displaying F. magna from US states, Canadian provinces and EU countries coloured according to their respective region/locus. Dotted ovals, closest interrelationships between EU and NA populations. Codes for NA enzootic regions and EU natural foci are explained in Tables 1 and 2, respectively