Procaryotic Genera
   Domain "Bacteria" Woese et al. 1990
     Phylum Proteobacteria Garrity and Holt 2001 see Phylum Proteobacteria Garrity et al. 2005
       Class "Gammaproteobacteria" nom. inval. see Class Gammaproteobacteria Garrity et al. 2005
         Order Acidithiobacillales Garrity et al. 2001 nom. ined. see Order Acidithiobacillales Garrity et al. 2005
           Family Thermithiobacillaceae [monotypic] see Family Thermithiobacillaceae Garrity et al. 2005
             Genus Thermithiobacillusᵀ Kelly and Wood 2000