[living organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Prokaryota
     Kingdom Archaea Woese et al. 1990 see Domain Archaea Woese et al. 1990
       Phylum Crenarchaeota Garrity and Holt 2001
         Class Thermoprotei Reysenbach 2002
           1 Order Acidilobales Prokofeva et al. 2009
           2 Order Desulfurococcales Huber and Stetter 2002
           3 Order Fervidicoccales Perevalova et al. 2010
           4 Order Sulfolobales Stetter 1989
           5 Order Thermoproteales Zillig and Stetter 1982