Phylogenetic tree of the various terrestrial isopod crustacean species included in this study. The topology of the tree corresponds to the consensus of the bootstrap analysis performed under the maximum likelihood criteria. Bootstrap values above 70% and Bayesian posterior probabilities above 0.9 are shown above and below branches respectively. Species in which Crmar2 and/or Mariner-5 were uncovered by PCR are marked with a filled circle and/or a star. Trichoniscus pusillus was used as an outgroup to root the present phylogeny based on the topology obtained in Michel-Salzat and Bouchon  and was not screened for the presence of the two TEs (N/A: not applicable). The other species were PCR screened but none of the two elements were amplified.