Ignisphaera Niederberger et al. 2006 Ignisphaera aggregans Niederberger et al. 2006 Universal Root Woese et al. 1990 Archaea Woese et al. 1990 Crenarchaeota (sic) Garrity and Holt 2021 Thermoproteota corrig. Garrity and Holt 2021 Thermoprotei Reysenbach 2002 Desulfurococcales Huber and Stetter 2002 Desulfurococcaceae Zillig et al. 1983 emend. Burggraf et al. 1997 Ignisphaera Niederberger et al. 2006 Desulfurococcaceae Zillig et al. 1983 emend. Burggraf et al. 1997 Thermosphaera Huber et al. 1998 Stetteria Jochimsen et al. 1998 Sulfophobococcus Hensel et al. 1997 Desulfurococcus Zillig et al. 1983 emend. Perevalova et al. 2005 Thermogladius Kochetkova et al. 2016 Staphylothermus Fiala et al. 1986 Aeropyrum Sako et al. 1996 Thermodiscus Stetter 2003 Ignicoccus Huber et al. 2000 Zestosphaera St. John et al. 2021 Ignisphaera aggregans Niederberger et al. 2006 Niederberger T.D. Götz D.K. McDonald I.R. Ronimus R.S. Morgan H.W. Ignisphaera aggregans gen. nov., sp. nov., a novel hyperthermophilic crenarchaeote isolated from hot springs in Rotorua and Tokaanu, New Zealand. 2006 56 5 965 971 International Journal of Systematic and Evolutionary Microbiology Int J Syst Evol Microbiol 1466-5026 1466-5034 10.1099/ijs.0.63899-0 16627639