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]
           Clade neomura Cavalier-Smith, 1987
             Domain Archaea Woese et al. 2024 [paraphyletic]
               Kingdom Thermoproteati Guy and Ettema 2024
                 Phylum Thermoproteotaᵀ Garrity and Holt 2021
                   Class Thermoproteiᵀ Reysenbach 2002
                     Order Acidilobales Prokofeva et al. 2009 [monotypic]
                       Family Acidilobaceaeᵀ Prokofeva et al. 2009
                         1 Genus "Candidatus Calypsonella" St. John and Reysenbach 2024 nom. pro-inval.
                         2 Genus "Candidatus Hestiella" St. John and Reysenbach 2024 nom. pro-inval.
                         3 Genus "Candidatus Tiamatella" St. John and Reysenbach 2024 nom. pro-inval.
                         4 Genus Acidilobusᵀ Prokofeva et al. 2000
                         5 Genus Aeropyrum Sako et al. 1996
                         6 Genus Caldisphaera Itoh et al. 2003 [monotypic]
                         7 Genus Stetteria Jochimsen et al. 1998 [monotypic]
                         8 Genus Thermodiscus Stetter 2003 [monotypic]