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
                       Genus Petrotogaᵀ Davey et al. 1993
                         1 Petrotoga halophila Miranda-Tello et al. 2007
                         2 Petrotoga mexicana Miranda-Tello et al. 2004
                         3 Petrotoga miothermaᵀ Davey et al. 1993
                         4 Petrotoga mobilis Lien et al. 1998
                         5 Petrotoga olearia L'Haridon et al. 2002
                         6 Petrotoga sibirica L'Haridon et al. 2002