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 Deinococcota Weisburg et al. 2021 [monotypic]
                 Class Deinococciᵀ Garrity and Holt 2002
                   Order Thermales Rainey and da Costa 2002 [monotypic]
                     Family Thermaceaeᵀ da Costa and Rainey 2002
                       1 Genus Allomeiothermus Jiao et al. 2023
                       2 Genus Calidithermus Raposo et al. 2019
                       3 Genus Marinithermus Sako et al. 2003 [monotypic]
                       4 Genus Meiothermus Nobre et al. 1996
                       5 Genus Oceanithermus Miroshnichenko et al. 2003
                       6 Genus Rhabdothermus Steinsbu et al. 2011
                       7 Genus Thermusᵀ Brock and Freeze 1969 (Approved Lists 1980)
                       8 Genus Vulcanithermus Miroshnichenko et al. 2003 [monotypic]