Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 2024
             Kingdom Thermotogati Battistuzzi and Hedges 2024
               Phylum Thermotogotaᵀ Reysenbach 2021 [monotypic]
                 Class Thermotogaeᵀ Reysenbach 2002
                   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
                       6 Genus Tepiditoga Mori et al. 2021