Figure 1

Rooted maximum likelihood phylogeny of SSU rRNA sequences from Thermotogales (45 sequences, 1265 nucleotide positions). Numbers at nodes represent the bootstrap values estimated by the non-parametric bootstrap procedure implemented in Treefinder (100 replicates of the original alignments) and the posterior probabilities computed by Mr Bayes (only values greater than 50% and 0.5 respectively, are shown). The scale bar represents the average number of substitution per site.