prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   Domain "Bacteria" Woese et al. 1990
     Phylum "Proteobacteria" Garrity et al. 2005 see Superphylum Proteobacteria Craig et al. 2010
       Class Gammaproteobacteria Garrity et al. 2005
         Order Chromatiales Imhoff 2005
           Family Halothiobacillaceae Kelly and Wood 2005
             1 Genus Halothiobacillus Kelly and Wood 2000
             2 Genus Thioalkalibacter Banciu et al. 2009
             3 Genus Thiofaba Mori and Suzuki 2008
             4 Genus Thiovirga Ito et al. 2005