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] 1 Order Chlamydialesᵀ Storz and Page 1971 (Approved Lists 1980)