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 Chlamydiota Garrity and Holt 2021 [monotypic]
                 Class Chlamydiiaᵀ Horn 2016 [monotypic]
                   Order Chlamydialesᵀ Storz and Page 1971 (Approved Lists 1980)
                     Family Simkaniaceae Everett et al. 1999
                       Genus Simkaniaᵀ Everett et al. 1999 [monotypic]
                         1 Simkania negevensisᵀ Everett et al. 1999