Fig. 2.

Phylogenetic tree depicting evolutionary relationships among assemblages of G duodenalis at the gdh locus. The analysis was inferred using the Neighbor-Joining method of the nucleotide sequence covering a 359-bp region (positions 103 to 461 of GenBank accession number L40508) of the gene. Bootstrap values lower than 50% were not displayed. Filled circles represent canine sequences from this study. Open circles and squares indicate canine and human sequences, respectively, reported in other Spanish studies [14, 21, 32]. Giardia ardeae was used as outgroup taxa