Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 2024
             Kingdom Pseudomonadati (Gibbons and Murray 1978) Oren and Göker 2024
               Phylum Pseudomonadotaᵀ Garrity et al. 2021
                 Class Gammaproteobacteriaᵀ Garrity et al. 2005
                   Order Enterobacterales Adeolu et al. 2016
                     Family Morganellaceae Adeolu et al. 2016
                       1 Genus Arsenophonus Gherna et al. 1991
                       2 Genus Moellerella Hickman-Brenner et al. 1984 [monotypic]
                       3 Genus Morganellaᵀ Fulton 1943 (Approved Lists 1980)
                       4 Genus Photorhabdus Boemare et al. 1993
                       5 Genus Proteus Hauser 1885 (Approved Lists 1980) nom. cons.
                       6 Genus Providencia Ewing 1962 (Approved Lists 1980)
                       7 Genus Xenorhabdus Thomas and Poinar 1979 (Approved Lists 1980)