[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990
     Phylum "Proteobacteria" Garrity et al. 2005 see Superphylum Proteobacteria Craig et al. 2010
       Class Betaproteobacteria Garrity et al. 2006
         Order Rhodocyclales Garrity et al. 2006
           Family Rhodocyclaceae Garrity et al. 2006
             Genus Azoarcus Reinhold-Hurek et al. 1993
               Azoarcus indigens Reinhold-Hurek et al. 1993