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)
                     01 Genus "Candidatus Rubidus" Pagnier et al. 2022 nom. pro-illeg., incertae sedis
                     02 Family Chlamydiaceaeᵀ Rake 1957 (Approved Lists 1980)
                     03 Family Parachlamydiaceae Everett et al. 1999
                     04 Family Simkaniaceae Everett et al. 1999
                     05 Family Waddliaceae Rurangirwa et al. 1999 [monotypic]
                     06 Family "Candidatus Criblamydiaceae" Thomas et al. 2020 [monotypic]
                     07 Family "Candidatus Parilichlamydiaceae" Stride et al. 2020
                     08 Family "Candidatus Piscichlamydiaceae" Horn 2020 [monotypic]
                     09 Family "Candidatus Actinochlamydiaceae" Steigen et al. 2013 nom. pro-inval. [monotypic]
                     10 Family "Candidatus Rhabdochlamydiaceae" Horn 2011 nom. pro-inval.