Domain Archaea Woese et al. 1990 Phylum Crenarchaeota Garrity and Holt 2001 Class Thermoprotei Reysenbach 2001 see Class Thermoprotei Reysenbach 2002 Order Desulfurococcales Huber and Stetter 2001 nom. inval. see Order Desulfurococcales Huber and Stetter 2002 Family Desulfurococcaceae Zillig and Stetter 1983 Genus Aeropyrum Sako et al. 1996 Genus Ignicoccus Huber et al. 2000 Genus Staphylothermus Stetter and Fiala 1986 Genus Stetteria Jochimsen et al. 1998 Genus Sulfophobococcus Hensel et al. 1997 Genus Thermodiscus Stetter, 2003 see Genus Thermodiscus Stetter 2003 Genus Thermosphaera Huber et al. 1998 1 Genus Desulfurococcus Zillig and Stetter 1983