Figure 1.

Phylogenetic tree highlighting the position of K. racemifer relative to the other type strains within the phylum ‘Chloroflexi’. The tree was inferred from 1,359 aligned characters [7,8] of the 16S rRNA gene sequence under the maximum likelihood (ML) criterion [9]. Rooting was done initially using the midpoint method [10] and then checked for its agreement with the current classification (Table 1). The branches are scaled in terms of the expected number of substitutions per site. Numbers above branches are support values from 750 ML bootstrap replicates [11] (left) and from 1,000 maximum parsimony bootstrap replicates [12] (right) if larger than 60%. Lineages with type strain genome sequencing projects registered in GOLD [13] are labeled with one asterisk, those also listed as ‘Complete and Published’ with two asterisks [14–17] as well as CP001337, CP000804, CP000909, CP002084, and AP012029.