Relative position of Torrestrongylus tetradorsalis and Macuahuitloides inexpectans as reconstructed in the ML tree used to estimate the posterior probabilities of the branches. The numbers to the right of each node indicate bootstrap support for parsimony and maximum likelihood as optimality criteria and the posterior probability of the branch. Syngamus trachea belongs to Strongyloidea. The tree and data matrix can be retrieved from http://opensiuc.lib.siu.edu/zool_data/4/