Procaryotic Genera Domain "Bacteria" Woese et al. 1990 Phylum Proteobacteria Garrity and Holt 2001 see Phylum Proteobacteria Garrity et al. 2005 Class "Betaproteobacteria" Garrity et al. 2001 nom. ined. see Class Betaproteobacteria Garrity et al. 2006 Order "Hydrogenophilales" nom. inval. [monotypic] see Order Hydrogenophilales Garrity et al. 2006 Family "Hydrogenophilaceae" nom. inval. see Family Hydrogenophilaceae Garrity et al. 2006 1 Genus Hydrogenophilus Hayashi et al. 1999 2 Genus Thiobacillus Beijerinck 1904 (Approved Lists 1980)