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 Fibrobacteres-Chlorobi-Bacteroidetes (FCB) Gupta 2004 Phylum "Calditrichaeota" Kublanov et al. 2017 [monotypic] Class "Calditrichae"ᵀ Kublanov et al. 2017 [monotypic] Order "Calditrichales"ᵀ Kublanov et al. 2017 [monotypic] Family "Calditrichaceae"ᵀ Kublanov et al. 2017 [monotypic] 1 Genus Caldithrixᵀ Miroshnichenko et al. 2003