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 Chlamydiaceaeᵀ Rake 1957 (Approved Lists 1980)
                       Genus Chlamydiaᵀ Jones et al. 1945 (Approved Lists 1980)
                         Chlamydia trachomatisᵀ (Busacca 1935) Rake 1957 (Approved Lists 1980)