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 Bacteroidetes Krieg et al. 2012 Class Bacteroidiaᵀ Krieg 2012 [monotypic] Order Bacteroidalesᵀ Krieg 2012 Family Bacteroidaceaeᵀ Pribram 1933 (Approved Lists 1980) Genus Acetothermus Dietrich et al. 1988 [monotypic] Acetothermus paucivoransᵀ Dietrich et al. 1988