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 "Enterobacteriales" Garrity and Holt 2001 nom. nud. [monotypic]
                     Family Enterobacteriaceaeᵀ Rahn 1937 (Approved Lists 1980)
                       Genus Morganella Fulton 1943 (Approved Lists 1980)
                         Morganella morganiiᵀ (Winslow et al. 1919) Fulton 1943 (Approved Lists 1980)
                           1 Morganella morganii subsp. morganiiᵀ (Winslow et al. 1919) Jensen et al. 1992
                           2 Morganella morganii subsp. sibonii Jensen et al. 1992