FIG. 4.

Phylogenetic tree showing the relationship of the 16S rRNA phylotypes affiliated with Fibrobacteres subphylum 2. An ML tree was constructed with the GTR model. A tree obtained with the GTR+G+I model was basically congruent with this tree. An ME tree was also constructed with the GTR+G+I model. A total of 1,054 unambiguously aligned nucleotides were used, corresponding to positions 54 to 1164 in E. coli (J01695). Bootstrap tests were performed with 100 resamplings for both the ML tree and ME trees, and the confidence values are indicated above (ML) and below (ME) the branches. The phylotypes and clusters obtained in this study are shown in bold letters. The number of contained phylotypes in the compressed clusters are shown in parentheses. The host termites are indicated in the clone codes as abbreviations listed in Table 2. The full tree is published as Fig. S1 in the supplemental material; Pl, P. latignathus; Ram, R. amamianus; CF, C. formosanus; Hs, H. sjoestedti; NK, N. koshunensis.