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 Thermotogae Reysenbach 2001 [monotypic]
               Class Thermotogaeᵀ Reysenbach 2002 [monotypic]
                 Order Thermotogalesᵀ Reysenbach 2002 [monotypic]
                   Family Thermotogaceaeᵀ Reysenbach 2002
                     01 Genus Thermotogaᵀ Stetter and Huber 1986
                     03 Genus Fervidobacterium Patel et al. 1985
                     10.1 Genus Thermococcoides Feng et al. 2010
                     11 Genus Thermosipho Huber et al. 1989