living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Prokaryotae see Superkingdom Prokarya
     Kingdom Monera Haeckel 1866 see Domain Bacteria Woese et al. 1990
       Division Bacteria (Haeckel 1894) see Domain Bacteria Woese et al. 1990
         "Phototrophic bacteria"
           Rhodospirillineae
             Family Rhodospirillaceae Pfennig and Trüper 1971 (Approved Lists 1980)
               Genus Rhodocyclus Pfennig 1978 (Approved Lists 1980)