Procaryotic Genera
   Domain "Bacteria" Woese et al. 1990
     Phylum Proteobacteria Garrity and Holt 2001 see Phylum Proteobacteria Garrity et al. 2005
       Class "Alphaproteobacteria" Garrity and Holt 2001 nom. nud. see Class Alphaproteobacteria Garrity et al. 2006
         Order Rickettsiales Gieszczykiewicz 1939 (Approved Lists 1980)
           Family Rickettsiaceae Pinkerton 1936 (Approved Lists 1980)
             1 Genus Rickettsia da Rocha-Lima 1916 (Approved Lists 1980)
             2 Genus Orientia Tamura et al. 1995
             3 Genus Wolbachia Hertig 1936 (Approved Lists 1980)