Those not shown on the nodes are poorly supported by all the three analyses.(TIF)Click here for additional data file.(32K, tif)Table S1List of taxonomic samples and sequences used in this study(DOC)Click here for additional data file.(95K, doc)Table S2PAML results for branches a-p except for branch b and m in Figure 1.(DOC)Click here for additional data file.(137K, doc)AcknowledgmentsWe thank Prof