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 Aquificae Reysenbach 2001 [monotypic]
               Class Aquificaeᵀ Reysenbach 2002
                 Order Desulfurobacteriales Gupta and Lali 2014 [monotypic]
                   Family Desulfurobacteriaceaeᵀ L'Haridon et al. 2006
                     1 Genus Balnearium Takai et al. 2003 [monotypic]
                     2 Genus Desulfurobacteriumᵀ L'Haridon et al. 1998
                     3 Genus Phorcysia Pérez-Rodríguez et al. 2012 [monotypic]
                     4 Genus Thermovibrio Huber et al. 2002