Natura - nature actualia - actual entities Mundus Plinius - physical world naturalia - natural bodies Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020] Domain Bacteria Woese et al. 2024 Kingdom Bacillatiᵀ (Gibbons and Murray 1978) Oren and Göker 2024 Phylum Bacillotaᵀ Gibbons and Murray 2021 Class Clostridia Rainey 2010 Order Eubacteriales Buchanan 1917 (Approved Lists 1980) Family Clostridiaceae Pribram 1933 (Approved Lists 1980) 01 Genus Abyssisolibacter Kim et al. 2024 02 Genus Acidaminobacter Stams and Hansen 1985 [monotypic] 03 Genus Anaeromicrobium Zhang et al. 2017 04 Genus Anaeromonas Zhang et al. 2022 05 Genus Anaerophilus Zhang et al. 2025 06 Genus Anaerosolibacter Hong et al. 2015 07 Genus Anaerosporobacter Jeong et al. 2007 [monotypic] 08 Genus Anoxynatronum Garnova et al. 2003 [monotypic] 09 Genus Caloramator Collins et al. 1994 10 Genus Caminicella Alain et al. 2002 [monotypic] 11 Genus Clostridiumᵀ Prazmowski 1880 (Approved Lists 1980) 12 Genus Crassaminicella Lakhal et al. 2015 13 Genus Fervidicella Ogg and Patel 2010 [monotypic] 14 Genus Fonticella Fraj et al. 2013 [monotypic] 15 Genus Geosporobacter Klouche et al. 2007 [monotypic] 16 Genus Haloimpatiens Wu et al. 2016 17 Genus Hathewaya Lawson and Rainey 2016 18 Genus Hungatella Kaur et al. 2014 19 Genus Hydrogenispora Liu et al. 2014 [monotypic] 20 Genus Inconstantimicrobium Wylensek et al. 2021 21 Genus Irregularibacter Lagkouvardos et al. 2016 22 Genus Isachenkonia Zavarzina et al. 2020 23 Genus Lactonifactor Clavel et al. 2007 [monotypic] 24 Genus Lutispora Shiratori et al. 2008 [monotypic] 25 Genus Marinisporobacter Vandieken et al. 2017 26 Genus Oceanirhabdus Pi et al. 2013 [monotypic] 27 Genus Oxobacter Collins et al. 1994 [monotypic] 28 Genus Pilosibacter Yan et al. 2024 29 Genus Proteiniborus Niu et al. 2008 [monotypic] 30 Genus Proteiniclasticum Zhang et al. 2010 31 Genus Salimesophilobacter Zhang et al. 2013 32 Genus Sarcina Goodsir 1842 (Approved Lists 1980) 33 Genus Thermobrachium Engle et al. 1996 [monotypic] 34 Genus Thermotalea Ogg and Patel 2009 [monotypic] 35 Genus Tindallia Kevbrin et al. 1999 36 Genus Youngiibacter Lawson et al. 2014 37 Genus "Anaeromassilibacillus" Guilhot et al. 2016 nom. inval. 38 Genus "Beduinia" corrig. Mourembou et al. 2015 nom. inval. 39 Genus "Desnuesiella" Hadjadj et al. 2016 nom. inval. 40 Genus "Inediibacterium" Alou et al. 2017 nom. inval. 41 Genus "Linmingia" Oh et al. 2004 nom. inval. 42 Genus "Massilioclostridium" Lo et al. 2017 nom. inval. 43 Genus "Candidatus Cryptoclostridium" Glendinning et al. 2022 44 Genus "Candidatus Dwaynesavagella" corrig. Thompson et al. 2020 45 Genus "Candidatus Neoarthromitus" corrig. Snel et al. 2020