Caldicellulosiruptor sp. None 2015 Caldicellulosiruptor sp. None 2015 Universal Root Woese et al. 1990 Bacteria (None 2015) Woese et al. 1990 Firmicutes (sic) Gibbons and Murray 2021 Bacillota corrig. Gibbons and Murray 2021 Firmacutes (sic) Gibbons and Murray 2021 Clostridia Rainey 2010 Thermoanaerobacterales (Garrity and Holt 2001) Wiegel 2010 emend. Lv et al. 2020 Thermovenabulaceae Parks et al. 2018 Caldicellulosiruptor Rainey et al. 1995 emend. Onyenwoke et al. 2006 Caldicellulosiruptor sp. None 2015 Caldicellulosiruptor Rainey et al. 1995 emend. Onyenwoke et al. 2006 Caldicellulosiruptor obsidiansis Hamilton-Brehm et al. 2010 Caldicellulosiruptor kristjanssonii Bredholt et al. 1999 Caldicellulosiruptor acetigenus (Nielsen et al. 1994) Onyenwoke et al. 2006 Caldicellulosiruptor lactoaceticus Mladenovska et al. 1997 Caldicellulosiruptor owensensis Huang et al. 1998 Caldicellulosiruptor saccharolyticus Rainey et al. 1995 Caldicellulosiruptor hydrothermalis Miroshnichenko et al. 2008 Caldicellulosiruptor kronotskyensis Miroshnichenko et al. 2008 Caldicellulosiruptor changbaiensis Bing et al. 2015 Caldicellulosiruptor bescii Yang et al. 2010 Caldicellulosiruptor diazotrophicus Chen et al. 2021 No reference is available 2015 No reference is available 2015