[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 Rickettsiaceae Pinkerton 1936 (Approved Lists 1980)
             Genus Rickettsia da Rocha-Lima 1916 (Approved Lists 1980)
               01 Rickettsia prowazekii da Rocha-Lima 1916 (Approved Lists 1980)
               02 Rickettsia aeschlimannii Beati et al. 1997
               03 Rickettsia africae Kelly et al. 1996
               04 Rickettsia akari Huebner et al. 1946 (Approved Lists 1980)
               05 Rickettsia australis Philip 1950 (Approved Lists 1980)
               06 Rickettsia bellii Philip et al. 1983
               07 Rickettsia canadensis corrig. McKiel et al. 1967 (Approved Lists 1980)
               08 Rickettsia conorii Brumpt 1932 (Approved Lists 1980)
               09 Rickettsia felis Bouyer et al. 2001
               10 Rickettsia heilongjiangensis Fournier et al. 2006
               11 Rickettsia helvetica Beati et al. 1993
               12 Rickettsia honei Stenos et al. 1998
               13 Rickettsia japonica Uchida et al. 1992
               14 Rickettsia massiliae Beati and Raoult 1993
               15 Rickettsia montanensis corrig. (ex Lackman et al. 1965) Weiss and Moulder 1984
               16 Rickettsia parkeri Lackman et al. 1965 (Approved Lists 1980)
               17 Rickettsia peacockii Niebylski et al. 1997
               18 Rickettsia rhipicephali (ex Burgdorfer et al. 1978) Weiss and Moulder 1988
               19 Rickettsia rickettsii (Wolbach 1919) Brumpt 1922 (Approved Lists 1980)
               20 Rickettsia sibirica Zdrodovskii 1948 (Approved Lists 1980)
               21 Rickettsia slovaca Sekeyová et al. 1998
               22 Rickettsia tamurae Fournier et al. 2006
               23 Rickettsia typhi (Wolbach and Todd 1920) Philip 1943 (Approved Lists 1980)