Hungateiclostridiaceae Zhang et al. 2018 Hungateiclostridiaceae Zhang et al. 2018 Hungateiclostridium Zhang et al. 2018 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 Clostridiales Prévot 1953 (Approved Lists 1980) Hungateiclostridiaceae Zhang et al. 2018 Clostridiales Prévot 1953 (Approved Lists 1980) Oscillospiraceae Peshkoff 1940 (Approved Lists 1980) emend. Tindall 2019 Caldicoprobacteraceae Yokoyama et al. 2010 Gracilibacteraceae Lee et al. 2010 Ruminococcaceae Rainey 2010 Christensenellaceae Morotomi et al. 2012 Defluviitaleaceae Jabari et al. 2012 Proteinivoraceae Kevbrin et al. 2014 Incertae sedis 153 None 2015 Symbiobacteriaceae Shiratori-Takano et al. 2014 Peptoniphilaceae Johnson et al. 2014 Peptococcaceae Rogosa 1971 (Approved Lists 1980) emend. Lv et al. 2020 Heliobacteriaceae Asao and Madigan 2010 Incertae sedis 42 None 2015 Incertae sedis 180 None 2015 Mogibacteriaceae None 2015 Veillonellaceae Rogosa 1971 (Approved Lists 1980) emend. Campbell et al. 2015 Syntrophomonadaceae Zhao et al. 1993 emend. Zhang et al. 2019 Peptostreptococcaceae Ezaki 2010 Lachnospiraceae Rainey 2010 Eubacteriaceae Ludwig et al. 2010 Clostridiaceae Pribram 1933 (Approved Lists 1980) emend. Spring 2021 Desulfotomaculaceae Stackebrandt 2020 non Desulfotomaculaceae Watanabe et al. 2020 Incertae sedis 9 Garrity et al. 2007 Incertae sedis 108 Lakhal et al. 2013 Incertae sedis 124 None 2015 Incertae sedis 158 None 2015 Incertae sedis 205 None 2015 Incertae sedis 44 None 2015 Incertae sedis 45 None 2015 Incertae sedis 57 None 2015 Incertae sedis 58 None 2015 Desulfitobacteriaceae Stackebrandt 2020 Thermincolaceae Stackebrandt 2020 Vallitaleaceae Quéméneur et al. 2019 Xylanivirgaceae Liu et al. 2020 Betainaceae Jones et al. 2019 Feifaniaceae Liu et al. 2021 Bianqueaceae Liu et al. 2021 Yeguiaceae Liu et al. 2021 Hungateiclostridium Zhang et al. 2018 Petroclostridium Zhang et al. 2018 Thermoclostridium Zhang et al. 2018 Ruminiclostridium Zhang et al. 2018 non Ruminiclostridium Yutin and Galperin 2013 Pseudoclostridium Zhang et al. 2018 Pseudobacteroides Horino et al. 2014 Anaerobacterium Horino et al. 2014 Ercella van Gelder et al. 2014 Fastidiosipila Falsen et al. 2005 Mageeibacillus Austin et al. 2016 Saccharofermentans Chen et al. 2010 Zhang X. Tu B. Dai L.-R. Lawson P.A. Zheng Z.-Z. Liu L.-Y. Deng Y. Zhang H. Cheng L. Petroclostridium xylanilyticum gen. nov., sp. nov., a xylan-degrading bacterium isolated from an oilfield, and reclassification of clostridial cluster III members into four novel genera in a new Hungateiclostridiaceae fam. nov. 2018 68 10 3197 3211 International Journal of Systematic and Evolutionary Microbiology Int J Syst Evol Microbiol 1466-5026 1466-5034 10.1099/ijsem.0.002966 30124399 Zhang X. Tu B. Dai L.-R. Lawson P.A. Zheng Z.-Z. Liu L.-Y. Deng Y. Zhang H. Cheng L. Petroclostridium xylanilyticum gen. nov., sp. nov., a xylan-degrading bacterium isolated from an oilfield, and reclassification of clostridial cluster III members into four novel genera in a new Hungateiclostridiaceae fam. nov. 2018 68 10 3197 3211 International Journal of Systematic and Evolutionary Microbiology Int J Syst Evol Microbiol 1466-5026 1466-5034 10.1099/ijsem.0.002966 30124399 Tindall B.J. The names Hungateiclostridium Zhang et al. 2018, Hungateiclostridium thermocellum (Viljoen et al. 1926) Zhang et al. 2018, Hungateiclostridium cellulolyticum (Patel et al. 1980) Zhang et al. 2018, Hungateiclostridium aldrichii (Yang et al. 1990) Zhang et al. 2018, Hungateiclostridium alkalicellulosi (Zhilina et al. 2006) Zhang et al. 2018, Hungateiclostridium clariflavum (Shiratori et al. 2009) Zhang et al. 2018, Hungateiclostridium straminisolvens (Kato et al. 2004) Zhang et al. 2018 and Hungateiclostridium saccincola (Koeck et al. 2016) Zhang et al. 2018 contravene Rule 51b of the International Code of Nomenclature of Prokaryotes and require replacement names in the genus Acetivibrio Patel et al. 1980. 2019 69 12 3927 3932 International Journal of Systematic and Evolutionary Microbiology Int J Syst Evol Microbiol 1466-5026 1466-5034 10.1099/ijsem.0.003685 31526446 Hungateiclostridiaceae Zhang et al. 2018 is therefore based upon a nomenclatural type that has no standing in nomenclature.