Palaeococcus Takai et al. 2000 Palaeococcus Takai et al. 2000 Palaeococcus ferrophilus Takai et al. 2000 Universal Root Woese et al. 1990 Archaea Woese et al. 1990 Euryarchaeota (sic) Garrity and Holt 2001 Methanobacteriota corrig. Garrity and Holt 2001 Thermococci Zillig and Reysenbach 2002 Thermococcales Zillig et al. 1988 Thermococcaceae Zillig et al. 1988 Palaeococcus Takai et al. 2000 Thermococcaceae Zillig et al. 1988 Pyrococcus Fiala and Stetter 1986 Thermococcus Zillig et al. 1983 Palaeococcus ferrophilus Takai et al. 2000 Palaeococcus pacificus Zeng et al. 2013 Palaeococcus helgesonii Amend et al. 2006 Zeng X. Zhang X. Jiang L. Alain K. Jebbar M. Shao Z. Palaeococcus pacificus sp. nov., an archaeon from deep-sea hydrothermal sediment 2013 63 6 2155 2159 International Journal of Systematic and Evolutionary Microbiology Int J Syst Evol Microbiol 1466-5026 1466-5034 10.1099/ijs.0.044487-0 23104364 Amend J.P. Meyer-Dombard D.R. Sheth S.N. Zolotova N. Amend A.C. Palaeococcus helgesonii sp. nov., a facultatively anaerobic, hyperthermophilic archaeon from a geothermal well on Vulcano Island, Italy 2003 179 394 401 Archives of Microbiology Arch Microbiol 0302-8933 1432-072X 10.1007/s00203-003-0542-7 12682713 Takai K. Sugai A. Itoh T. Horikoshi K. Palaeococcus ferrophilus gen. nov., sp. nov., a barophilic, hyperthermophilic archaeon from a deep-sea hydrothermal vent chimney. 2000 50 2 489 500 International Journal of Systematic and Evolutionary Microbiology Int J Syst Evol Microbiol 1466-5026 1466-5034 10.1099/00207713-50-2-489 10758851 Takai K. Sugai A. Itoh T. Horikoshi K. Palaeococcus ferrophilus gen. nov., sp. nov., a barophilic, hyperthermophilic archaeon from a deep-sea hydrothermal vent chimney. 2000 50 2 489 500 International Journal of Systematic and Evolutionary Microbiology Int J Syst Evol Microbiol 1466-5026 1466-5034 10.1099/00207713-50-2-489 10758851