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 Ehrlichiaceae Moshkovski 1945 (Approved Lists 1980) see Family Anaplasmataceae Philip 1957 (Approved Lists 1980)
             1 Genus Ehrlichia Moshkovski 1945 (Approved Lists 1980)
             2 Genus Aegyptianella Carpano 1929 (Approved Lists 1980)
             3 Genus Anaplasma Theiler 1910 (Approved Lists 1980)
             4 Genus Cowdria Moshkovski 1947 (Approved Lists 1980) see Genus Ehrlichia Moshkovski 1945 (Approved Lists 1980)
             5 Genus Neorickettsia Philip et al. 1953 (Approved Lists 1980)
             6 Genus Xenohaliotis