[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 Alphaproteobacteria Garrity et al. 2006
         Order Rhizobiales Kuykendall 2006
           Family Hyphomicrobiaceae Babudieri 1950 (Approved Lists 1980)
             Genus Microcyclus Ørskov 1928 (Approved Lists 1980) nom. illeg. see Genus Ancylobacter Raj 1983