[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 Rickettsiales Gieszczykiewicz 1939 (Approved Lists 1980)
           Family Anaplasmataceae Philip 1957 (Approved Lists 1980)
             Genus Ehrlichia Moshkovski 1945 (Approved Lists 1980)
               1 Ehrlichia canis (Donatien and Lestoquard 1935) Moshkovski 1945 (Approved Lists 1980)
               2 Ehrlichia chaffeensis Anderson et al. 1992
               3 Ehrlichia ewingii Anderson et al. 1992
               4 Ehrlichia muris Wen et al. 1995
               5 Ehrlichia ruminantium (Cowdry 1925) Dumler et al. 2001