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 "Gammaproteobacteria" Garrity et al., 2005 [monotypic]
                 Class Gammaproteobacteriaᵀ Garrity et al. 2005
                   Order Oceanospirillales Garrity et al. 2005
                     Family Oceanospirillaceaeᵀ Garrity et al. 2005
                       Genus Oceanospirillumᵀ Hylemon et al. 1973 (Approved Lists 1980)
                         Oceanospirillum beijerinckii (Williams and Rittenberg 1957) Hylemon et al. 1973 (Approved Lists 1980)
                           1 Oceanospirillum beijerinckii subsp. beijerinckiiᵀ (Williams and Rittenberg 1957) Pot et al. 1989
                           2 Oceanospirillum beijerinckii subsp. pelagicum (Terasaki 1973) Pot et al. 1989