living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Prokaryotae see Superkingdom Prokarya
     Kingdom Monera Haeckel 1866 see Domain Bacteria Woese et al. 1990
       Division Bacteria (Haeckel 1894) see Domain Bacteria Woese et al. 1990
         "Rickettsias" see Order Rickettsiales Gieszczykiewicz 1939 (Approved Lists 1980)
           Order Rickettsiales Gieszczykiewicz 1939 (Approved Lists 1980)
             Family Rickettsiaceae Pinkerton 1936 (Approved Lists 1980)
               Tribe Ehrlichieae Philip 1957 (Approved Lists 1980) see Family Anaplasmataceae Philip 1957 (Approved Lists 1980)
                 Genus Cowdria Moshkovski 1947 (Approved Lists 1980) see Genus Ehrlichia Moshkovski 1945 (Approved Lists 1980)
                   Cowdria ruminantium (Cowdry 1925) Moshkovski 1947 (Approved Lists 1980) see Ehrlichia ruminantium (Cowdry 1925) Dumler et al. 2001