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
                     Genus Thermotogaᵀ Stetter and Huber 1986
                       1 Thermotoga elfii Ravot et al. 1995
                       2 Thermotoga hypogea Fardeau et al. 1997
                       3 Thermotoga lettingae Balk et al. 2002
                       4 Thermotoga maritimaᵀ Stetter and Huber 1986
                       5 Thermotoga naphthophila Takahata et al. 2001
                       6 Thermotoga neapolitana Jannasch et al. 1989
                       7 Thermotoga petrophila Takahata et al. 2001
                       8 Thermotoga subterranea Jeanthon et al. 2000
                       9 Thermotoga thermarum Windberger et al. 1992