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) 1 Genus Rickettsiaᵀ da Rocha-Lima 1916 (Approved Lists 1980) 1.0 [Genus "Dermacentroxenus" Wolbach 1919] see Genus Rickettsia da Rocha-Lima 1916 (Approved Lists 1980) 2 Genus Orientia Tamura et al. 1995 [monotypic] n.0 [Tribe Rickettsieaeᵀ Philip 1957 (Approved Lists 1980)] see Family Rickettsiaceae Pinkerton 1936 (Approved Lists 1980) n.1 [Tribe Ehrlichieae Philip 1957 (Approved Lists 1980)] see Family Anaplasmataceae Philip 1957 (Approved Lists 1980) n.2 [Tribe Wolbachieae Philip 1955 (Approved Lists 1980)] see Family Rickettsiaceae Pinkerton 1936 (Approved Lists 1980)