Phylogenetic relationships of 117 bacteria from the four different thermophilicity classes. The relationship is based on predicted 16S rRNA sequences. Red tips are hyperthermophiles, orange are thermophiles, green are mesophiles and blue are psychrophiles. The purple lines indicate the species exemplifying evolutionary flexibility, as discussed in the text.
Jensen et al. BMC Genomics 2012 13(Suppl 7):S3 doi:10.1186/1471-2164-13-S7-S3