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 Rhizobiales Kuykendall 2006
                     Family Beijerinckiaceae Garrity et al. 2006
                       Genus Beijerinckiaᵀ Derx 1950 (Approved Lists 1980)
                         Beijerinckia derxii Tchan 1957 (Approved Lists 1980)
                           Beijerinckia derxii subsp. derxiiᵀ (Tchan 1957) Thompson and Skerman 1981