Palaeococcus helgesonii Amend et al. 2006 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 Palaeococcus helgesonii Amend et al. 2006 Palaeococcus Takai et al. 2000 Palaeococcus ferrophilus Takai et al. 2000 Palaeococcus pacificus Zeng et al. 2013 Palaeococcus helgesonii Amend et al. 2006 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 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