[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990
     Phylum "Proteobacteria" Garrity et al. 2005 see Superphylum Proteobacteria Craig et al. 2010
       Class Gammaproteobacteria Garrity et al. 2005
         Order "Enterobacteriales" Garrity and Holt 2001 nom. nud.
           Family Enterobacteriaceae Rahn 1937 (Approved Lists 1980)
             Genus Morganella Fulton 1943 (Approved Lists 1980)
               [Morganella morganii] (Winslow et al. 1919) Fulton 1943 (Approved Lists 1980)
                 Morganella morganii subsp. morganiiᵀ (Winslow et al. 1919) Jensen et al. 1992