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 Peptostreptococcales Chuvochina et al. 2024 Family Peptostreptococcaceaeᵀ Ezaki 2010 01 Genus Acetoanaerobium Sleat et al. 1985 [monotypic] 02 Genus Asaccharospora Gerritsen et al. 2014 03 Genus Clostridioides Lawson et al. 2016 04 Genus Criibacterium Maheux et al. 2021 05 Genus Faecalimicrobium Bello et al. 2024 06 Genus Filifactor Collins et al. 1994 07 Genus Intestinibacter Gerritsen et al. 2014 [monotypic] 08 Genus Maledivibacter Li et al. 2016 09 Genus Mediannikoviicoccus Ly et al. 2023 10 Genus Metaclostridioides Bello et al. 2024 11 Genus Paeniclostridium Sasi Jyothsna et al. 2016 12 Genus Paraclostridium Sasi Jyothsna et al. 2016 13 Genus Paramaledivibacter Li et al. 2016 14 Genus Peptacetobacter Chen et al. 2020 15 Genus Peptoanaerobacter Sizova et al. 2016 16 Genus Peptoclostridium Galperin et al. 2016 17 Genus Peptostreptococcusᵀ Kluyver and van Niel 1936 (Approved Lists 1980) 18 Genus Proteocatella Pikuta et al. 2009 19 Genus Romboutsia Gerritsen et al. 2014 20 Genus Terrisporobacter Gerritsen et al. 2014 21 Genus Wukongibacter Li et al. 2016