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 Alteromonadales Bowman and McMeekin 2005
                     Family Pseudoalteromonadaceae Ivanova et al. 2004
                       Genus Pseudoalteromonasᵀ Gauthier et al. 1995
                         Pseudoalteromonas citrea (Gauthier 1977) Gauthier et al. 1995