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 "Deltaproteobacteria" Kuever et al., 2006 [polyphyletic] Class Thermodesulfobacteria Hatchikian et al. 2002 [monotypic] Order Thermodesulfobacterialesᵀ Hatchikian et al. 2002 [monotypic] Family Thermodesulfobacteriaceaeᵀ Hatchikian et al. 2002 Genus Caldimicrobium Miroshnichenko et al. 2009 [monotypic] Caldimicrobium rimaeᵀ Miroshnichenko et al. 2009