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 1 Family Acidithiobacillaceae Garrity et al. 2001 nom. ined. [monotypic] see Family Acidithiobacillaceae Garrity et al. 2005 2 Family Thermithiobacillaceae [monotypic] see Family Thermithiobacillaceae Garrity et al. 2005