Natura - nature actualia - actual entities Mundus Plinius - physical world naturalia - natural bodies [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020] Domain Bacteria Woese et al. 1990 [paraphyletic?] Superphylum Planctomycetes-Verrucomicrobia-Chlamydiae (PVC) Wagner and Horn 2006 Phylum Chlamydiae Garrity and Holt 2012 [monotypic] Class Chlamydiaeᵀ Cavalier-Smith 2002 [monotypic] Order Chlamydialesᵀ Storz and Page 1971 (Approved Lists 1980) Family Simkaniaceae Everett et al. 1999 Genus Simkaniaᵀ Everett et al. 1999 [monotypic] Simkania negevensisᵀ Everett et al. 1999