Phylogenetic analyses on all available R2 amino acid sequences.

<p>A) Minimum evolution (ME; SBL = 23.62); B) Maximum Likelihood (ML; -lnL = 68687.39); C) Bayesian Inference (BI; -lnL = 70547.77). The four main clades (R2-A, R2-B, R2-C and R2-D) are indicated in each tree. In the ME and ML trees, grey-scale squares indicate bootstrap value intervals as represented in the schematic legend within A) and B) panels’ top left corner, respectively. In the BI tree, asterisks indicate posterior probability <i>P</i> values as in the C) panel’s top left corner legend. Acronyms are as in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0057076#pone-0057076-t001" target="_blank">Table 1</a> and <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0057076#pone.0057076.s002" target="_blank">Table S1</a>.