Natura - nature actualia - actual entities Mundus Plinius - physical world naturalia - natural bodies [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020] Domain Bacteria Woese et al. 1990 [paraphyletic?] Superphylum "Proteobacteria" Craig et al. 2010 Phylum "Alphaproteobacteria" Garrity et al., 2006 [monotypic] Class Alphaproteobacteriaᵀ Garrity et al. 2006 Order Rickettsiales Gieszczykiewicz 1939 (Approved Lists 1980) Family Rickettsiaceae Pinkerton 1936 (Approved Lists 1980) [Genus "Dermacentroxenus" Wolbach 1919] see Genus Rickettsia da Rocha-Lima 1916 (Approved Lists 1980) ["Dermacentroxenus murinus" Kulagin 1951] see Rickettsia akari Huebner et al. 1946 (Approved Lists 1980) ["Dermacentroxenus rickettsii" Wolbach 1919] see Rickettsia rickettsii (Wolbach 1919) Brumpt 1922 (Approved Lists 1980) ["Dermacentroxenus typhi" Wolbach and Todd 1920] see Rickettsia typhi (Wolbach and Todd 1920) Philip 1943 (Approved Lists 1980)