Clostridiales Prévot 1953 (Approved Lists 1980) Clostridiales Prévot 1953 (Approved Lists 1980) Clostridium Prazmowski 1880 (Approved Lists 1980) emend. Lawson and Rainey 2016 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) Clostridia Rainey 2010 Haloanaerobiales (sic) Rainey et al. 1995 Halanaerobiales corrig. Rainey et al. 1995 Natranaerobiales Mesbah et al. 2007 Thermoanaerobacterales (Garrity and Holt 2001) Wiegel 2010 emend. Lv et al. 2020 Eubacteriales Buchanan 1917 (Approved Lists 1980) emend. Tindall 2019 Thermoanaerobacteriales Garrity and Holt 2001 Syntrophomonadales Sorokin et al. 2016 Thermosediminibacterales Zhang et al. 2019 Thermovenabulales Parks et al. 2018 Moorellales Lv et al. 2020 Koleobacterales Sakamoto et al. 2021 Monoglobacales None 2015 Incertae sedis 650 Sorokin et al. 2021 Borkfalkiales corrig. Hildebrand et al. 2019 Comantemales (sic) Hildebrand et al. 2019 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 Hungateiclostridiaceae Zhang et al. 2018 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 Shiratori-Takano H. Akita K. Yamada K. Itoh T. Sugihara T. Beppu T. Ueda K. 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Enlightening the taxonomy darkness of human gut microbiomes with a cultured biobank. 2021 9 1 119 119 Microbiome Microbiome 2049-2618 10.1186/s40168-021-01064-3 34020714 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 Jones H.J. Kröber E. Stephenson J. Mausz M.A. Jameson E. Millard A. Purdy K.J. Chen Y. A new family of uncultivated bacteria involved in methanogenesis from the ubiquitous osmolyte glycine betaine in coastal saltmarsh sediments. 2019 7 1 120 120 Microbiome Microbiome 2049-2618 10.1186/s40168-019-0732-4 31464644 Quéméneur M. Erauso G. Frouin E. 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Guillot G. Magrou. J. Prévot A.R. Rosset D. Urbain A. 1953 2 1 692 Dictionnaire des Bactéries Pathogènes Masson et Cie Paris Stackebrandt E. Rosenberg E. DeLong E.F. Lory S. Stackebrandt E. Thompson F. The Emended Family Peptococcaceae and Description of the Families Desulfitobacteriaceae, Desulfotomaculaceae, and Thermincolaceae 2014 1 4 285 290 The Prokaryotes: Firmicutes and Tenericutes Springer Berlin Heidelberg New York 3642301193 10.1007/978-3-642-30120-9_364 Eubacteriales Buchanan 1917 (Approved Lists 1980) emend. Tindall 2019 Skerman V.B.D. McGowan V. Sneath P.H.A. Approved Lists of Bacterial Names 1980 30 1 225 420 International Journal of Systematic Bacteriology Int J Syst Bacteriol 0020-7713 10.1099/00207713-30-1-225 Prévot A.R. Hauderoy P. Ehringer G. Guillot G. Magrou. J. Prévot A.R. Rosset D. Urbain A. 1953 2 1 692 Dictionnaire des Bactéries Pathogènes Masson et Cie Paris 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