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 Petrotogales Bhandari and Gupta 2014 [monotypic]
                   Family Petrotogaceaeᵀ Bhandari and Gupta 2014
                     1 Genus Defluviitoga Ben Hania et al. 2012 [monotypic]
                     2 Genus Geotoga Davey et al. 1993
                     3 Genus Marinitoga Wery et al. 2001
                     4 Genus Oceanotoga Jayasinghearachchi and Lal 2011 [monotypic]
                     5 Genus Petrotogaᵀ Davey et al. 1993