[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 Alphaproteobacteria Garrity et al. 2006
         Order Rhizobiales Kuykendall 2006 see Order Hyphomicrobiales Douglas 1957 (Approved Lists 1980)
           Family Brucellaceae Breed et al. 1957 (Approved Lists 1980) see Family Bartonellaceae Gieszczykiewicz 1939 (Approved Lists 1980)
             Genus Brucella Meyer and Shaw 1920 (Approved Lists 1980)
               Brucella melitensis (Hughes 1893) Meyer and Shaw 1920 (Approved Lists 1980)