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]
               Superphylum TACK Guy and Ettema 2011
                 Phylum Crenarchaeota Garrity and Holt 2001
                   Class Thermoprotei Reysenbach 2002
                     Order Sulfolobales Stetter 1989 [monotypic]
                       Family Sulfolobaceaeᵀ Stetter 1989
                         Genus Metallosphaera Huber et al. 1989
                           1 Metallosphaera sedulaᵀ Huber et al. 1989
                           2 Metallosphaera cuprina Liu et al. 2011
                           3 Metallosphaera hakonensis (Takayanagi et al. 1996) Kurosawa et al. 2003
                           4 Metallosphaera prunae Fuchs et al. 1996
                           5 Metallosphaera tengchongensis Peng et al. 2015