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Phylogenetic tree based on Bayesian analysis of ITS1-5.8S-ITS2 with nodal support indicated on the branches by posterior probabilities. The gray boxed clade includes individuals of Trichobilharzia franki, all samples from snails are from Radix auricularia and the samples from this study are in bold. Blue arrows point to specimens that were reported from putative R. auricularia outside of the T. franki clade. The green box highlights the “peregra” group (sensu ); these species are often confused for T. franki but mostly come from A. balthica. The double asterisk indicates that the snail host in the study was also characterized genetically. Taxa are listed with their corresponding GenBank accession number followed by the country of collections (see Table 4).