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 Symbiobacteriaceae Shiratori-Takano et al. 2014 [monotypic] Genus Symbiobacteriumᵀ Ohno et al. 2000 [monotypic]