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