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]
           Clade neomura Cavalier-Smith, 1987
             Domain Archaea Woese et al. 1990 [paraphyletic]
               Phylum Euryarchaeota Garrity and Holt 2001
                 Class Thermoplasmata Reysenbach 2002 [monotypic]
                   Order Thermoplasmatalesᵀ Reysenbach 2002
                     Family Cuniculiplasmataceae Golyshina et al. 2016
                     1 Genus Thermogymnomonas Itoh et al. 2007, incertae sedis [monotypic]
                     2 Family Thermoplasmataceaeᵀ Reysenbach 2002 [monotypic]
                     3 Family Picrophilaceae Schleper et al. 1996 [monotypic]
                     4 Family Ferroplasmaceae Golyshina et al. 2000