[View Larger Version of Figure 5B (173K JPEG file)]

Figure 5B. Tree for Crenarchaeota. Phylogenetic trees showing present archaeal diversity derived from comparative analysis of 16S rRNA gene sequences. The trees were constructed using the ARB software package with an ARB sequence database consisting of more than 2500 complete and partial sequences. Major lineages (phyla) on Crenarchaeota and Euryarchaeota trees are shown as wedges with horizontal dimensions reflecting the known degree of divergence within that lineage. The numbers inside the wedges indicate total numbers of sequences included in each group. Phyla with cultivated representatives are in grey. Phyla known only from environmental sequences are in white and named after the first clones found from within the group. Detailed explanations of tree reconstruction are given in the text (see section 4.1). The scale bar represents 0.1 changes per nucleotide.