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 maris Hylemon et al. 1973 (Approved Lists 1980)
                           Oceanospirillum maris subsp. williamsae Linn and Krieg 1984