FIG. 5.

Maximum-likelihood tree of the TG1 phylum, based on an alignment (1,260 base positions) of all available near-full-length 16S rRNA gene sequences. Representative members of other phyla were used as outgroups. Roman numerals indicate the major phylogenetic lineages in the TG1 phylum. The tree includes 21 novel sequences that were submitted to the GenBank since the first phylogenetic study of the TG1 phylum (14) was published, but details are shown for only those lineages (IId, V, and VI) that were not yet defined in that study.