Infirmifilum Zayulina et al. 2021 Infirmifilum Zayulina et al. 2021 Infirmifilum lucidum Zayulina et al. 2021 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 Thermofilales Zayulina et al. 2021 Thermofilaceae Burggraf et al. 1997 Infirmifilum Zayulina et al. 2021 Thermofilaceae Burggraf et al. 1997 Thermofilum Zillig et al. 1983 emend. Toshchakov et al. 2015 Infirmifilum lucidum Zayulina et al. 2021 Infirmifilum uzonense (Toshchakov et al. 2016) Zayulina et al. 2021 Zayulina K.S. Elcheninov A.G. Toshchakov S.V. Kochetkova T.V. Novikov A.A. Blamey J.M. Kublanov I.V. Novel hyperthermophilic crenarchaeon Infirmifilum lucidum gen. nov. sp. nov., reclassification of Thermofilum uzonense as Infirmifilum uzonense comb. nov. and assignment of the family Thermofilaceae to the order Thermofilales ord. nov. 2021 44 4 126230 126230 Systematic and Applied Microbiology Syst Appl Microbiol 0723-2020 10.1016/j.syapm.2021.126230 34293647 Zayulina K.S. Elcheninov A.G. Toshchakov S.V. Kochetkova T.V. Novikov A.A. Blamey J.M. Kublanov I.V. Novel hyperthermophilic crenarchaeon Infirmifilum lucidum gen. nov. sp. nov., reclassification of Thermofilum uzonense as Infirmifilum uzonense comb. nov. and assignment of the family Thermofilaceae to the order Thermofilales ord. nov. 2021 44 4 126230 126230 Systematic and Applied Microbiology Syst Appl Microbiol 0723-2020 10.1016/j.syapm.2021.126230 34293647