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?] Phylum Caldiserica Mori et al. 2009 [monotypic] Class Caldisericiaᵀ Mori et al. 2009 [monotypic] Order Caldisericalesᵀ Mori et al. 2009 [monotypic] Family Caldisericaceaeᵀ Mori et al. 2009 [monotypic] Genus Caldisericumᵀ Mori et al. 2009 [monotypic] 1 Caldisericum exileᵀ Mori et al. 2009