Figure 2.

Relationship of Dictyocaulus viviparus with Dictyocaulus sp. cf. eckerti and selected species representing different superfamilies of the order Strongylida, including Metastrongylus pudendotectus, M. salmi (Metastrongyloidea), Haemonchus contortus (Trichostrongyloidea), Oesophagostomum dentatum (Strongyloidea) and Ancylostoma caninum (Ancylostomatoidea), based on a phylogenetic analysis of concatenated amino acid sequence data for the 12 mt proteins by Bayesian inference. Posterior probabilities are indicated at each node. Scale bar represents number of substitutions per site.