[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 Bartonellaceae Gieszczykiewicz 1939 (Approved Lists 1980)
             Genus Bartonella Strong et al. 1915 (Approved Lists 1980)
               Bartonella bacilliformis (Strong et al. 1913) Strong et al. 1915 (Approved Lists 1980)