prokaryotes - bacteria see Domain Bacteria Woese et al. 1990 stat. inval.
   Domain "Bacteria" Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum "Proteobacteria" Garrity et al. 2005 stat. inval. see Phylum Pseudomonadota Garrity et al. 2021
       Class Gammaproteobacteria Garrity et al. 2005
         Order Acidiferrobacterales Kojima et al. 2015 [monotypic]
           Family Acidiferrobacteraceae Kojima et al. 2015
             1 Genus Acidiferrobacter Hallberg et al. 2011
             2 Genus Sulfuricaulis Kojima et al. 2016
             3 Genus Sulfurifustis Kojima et al. 2015