Domain Bacteria Woese et al. 1990
   candidate phyla radiation (CPR) Brown et al. 2015
     1 Candidate phylum Saccharibacteria (TM7) Albertsen et al. 2013
     2.1 Candidate phylum Kazan
     2.2.1 Candidate phylum CPR2 Brown et al. 2015
     2.2.2.1.1 Candidate phylum Gracilibacteria (BD1–5) Rinke et al. 2013
     2.2.2.1.2 Candidate phylum Peregrinibacteria (PER) Brown et al. 2015
     2.2.2.2.1.1 Candidate phylum Berkelbacteria (ACD58) Wrighton et al. 2014
     2.2.2.2.1.2.1.1 Candidate phylum CPR3 Brown et al. 2015
     2.2.2.2.1.2.1.2 Candidate phylum WS6 see Phylum Dojkabacteria Wrighton et al. 2016
     2.2.2.2.1.2.2.1 Candidate phylum WWE3 see Phylum Katanobacteria Hug et al. 2016
     2.2.2.2.1.2.2.2 Candidate superphylum Microgenomates (OP11) Brown et al. 2015
     2.2.2.2.2.1 Candidate phylum SM2F11 see Phylum Doudnabacteria Anantharaman et al. 2016
     2.2.2.2.2.2 Candidate superphylum Parcubacteria (OD1) Brown et al. 2015