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?]
             [Phylum "Proteobacteria" Garrity and Holt 2001] see Phylum Proteobacteria Garrity et al. 2005
               ["Alpha Group"] see Class Alphaproteobacteria Garrity et al. 2006
                 1 ["Prosthecate Bacteria"] see Order Caulobacterales Henrici and Johnson 1935 (Approved Lists 1980)
                 2 ["Budding Bacteria"] see Family Hyphomicrobiaceae Babudieri 1950 (Approved Lists 1980)
                 3 ["Acetic Acid bacteria"] see Family Acetobacteraceae (ex Henrici 1939) Gillis and De Ley 1980
                 4 ["Rickettsias"] see Order Rickettsiales Gieszczykiewicz 1939 (Approved Lists 1980)