prokaryotes - bacteria see Domain Bacteria Woese et al. 1990 stat. inval.
   Domain "Bacteria" Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum "Thermotogae" Reysenbach 2002 stat. inval. [monotypic] see Phylum Thermotogota Reysenbach 2021
       Class Thermotogae Reysenbach 2002
         Order Petrotogales Bhandari and Gupta 2014 [monotypic]
           Family Petrotogaceae Bhandari and Gupta 2014
             1 Genus Defluviitoga Ben Hania et al. 2012
             2 Genus Geotoga Davey et al. 1993
             3 Genus Marinitoga Wery et al. 2001
             4 Genus Oceanotoga Jayasinghearachchi and Lal 2011
             5 Genus Petrotoga Davey et al. 1993