Procaryotic Genera
   Domain "Bacteria" Woese et al. 1990
     Phylum Aquificae Reysenbach 2001 [monotypic]
       Class Aquificae Reysenbach 2001 nom. inval. [monotypic] see Class Aquificae Reysenbach 2002
         Order Aquificalesᵀ Reysenbach 2001 nom. inval. see Order Aquificales Reysenbach 2002
           1 Family Aquificaceae Reysenbach 2001 nom. inval. see Family Aquificaceae Reysenbach 2002
           2 Genus Desulfurobacterium L'Haridon et al. 1998, incertae sedis