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Bayesian topology based on 28S rDNA sequences of digenean parasites. GenBank accession numbers precede species names. New sequences obtained for the present study are in bold. Prosthenhystera spp. (Callodistomidae), Dicrocoelium dendriticum (Dicrocoeliidae), Degeneria halosauri, and Phyllodistomum spp. (both Gorgoderidae) were used as an outgroup. Support values are above nodes: posterior probabilities and bootstrap scores greater than 0.90 and 70, respectively, were considered well supported. The asterisk indicates the type-species of each genus. The branch length scale bar indicates the number of substitutions per site (information about the sequences are shown in the Table 2).