procaryotes
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum Proteobacteria Garrity and Holt 2001 nom. nud. see Phylum Proteobacteria Garrity et al. 2005 stat. inval.
       Class "Betaproteobacteria" "Garrity and Holt 2001" nom. nud. see Class Betaproteobacteria Garrity et al. 2006
         Order "Nitrosomonadales" "Garrity and Holt 2001" nom. nud. see Order Nitrosomonadales Garrity et al. 2006 nom. illeg.
           Family Gallionellaceae Henrici and Johnson 1935 (Approved Lists 1980) [monotypic]
             1 Genus Gallionella Ehrenberg 1838 (Approved Lists 1980) nom. cons.