A total of 35 sequences with 1392 bp valid positions passed through 50% positional conservatory filter in ARB were used for phylogenetic analysis. A neighbour-joining phylogenetic tree was constructed using the Jukes–Cantor correction in ARB (Saitou & Nei, 1987; Jukes & Cantor, 1969). Bootstrap resampling analyses with 1000 replicates were performed for the neighbour-joining, maximum-likelihood and maximum-parsimony analyses to estimate the confidence of the tree topologies. MEGA 4.0 (Tamura et al., 2007) was used for the neighbour-joining and maximum-parsimony analyses
and PHYML 2.4.5 (Guindon & Gascuel, 2003) was used for the maximum-likelihood analysis. The sequence similarity values were calculated using the calculate matrix function of the ARB program without a filter.