[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum "Proteobacteria" Garrity et al. 2005 stat. inval. see Phylum Pseudomonadota Garrity et al. 2021
       Class Betaproteobacteria Garrity et al. 2006
         Order Nitrosomonadales Garrity et al. 2006 nom. illeg. see Order Spirillales Prévot 1940 (Approved Lists 1980)
           Family Gallionellaceae Henrici and Johnson 1935 (Approved Lists 1980)
             Genus Gallionella Ehrenberg 1838 (Approved Lists 1980) nom. cons.
               Gallionella ferruginea Ehrenberg 1838 (Approved Lists 1980)