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 Terrabacteria Battistuzzi et al. 2004 Phylum Firmicutes corrig. Gibbons and Murray 1978 (Approved Lists 1980) Class Clostridia Rainey 2010 Order Halanaerobiales corrig. Rainey and Zhilina 1995 Family Halobacteroidaceae Zhilina and Rainey 1995 Genus Halonatronum Zhilina et al. 2001 [monotypic] 1 Halonatronum saccharophilumᵀ Zhilina et al. 2001