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
                       Genus Providencia Ewing 1962 (Approved Lists 1980)
                         1 Providencia alcalifaciens (de Salles Gomes 1944) Ewing 1962 (Approved Lists 1980)
                         2 Providencia burhodogranariea Juneja and Lazzaro 2009
                         3 Providencia heimbachae Müller et al. 1986
                         4 Providencia rustigianii Hickman-Brenner et al. 1983
                         5 Providencia sneebia Juneja and Lazzaro 2009
                         6 Providencia stuartii (Buttiaux et al. 1954) Ewing 1962 (Approved Lists 1980)
                         7 Providencia vermicola Somvanshi et al. 2006