[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020] Domain "Archaea" Woese et al. 1990 stat. inval. see Domain Archaea Woese et al. 2024 Phylum "Crenarchaeota" Garrity and Holt 2002 stat. inval. see Phylum Thermoproteota Garrity and Holt 2021 Class Thermoprotei Reysenbach 2002 Order Desulfurococcales Huber and Stetter 2002 Family Desulfurococcaceae Zillig and Stetter 1983 Genus Ignisphaera Niederberger et al. 2006 1 Ignisphaera aggregans Niederberger et al. 2006