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 Pseudomonadati (Gibbons and Murray 1978) Oren and Göker 2024 Phylum Spirochaetota Garrity and Holt 2021 Class Spirochaetiaᵀ Paster 2020 Order Brachyspirales Gupta et al. 2014 [monotypic] Family Brachyspiraceaeᵀ Paster 2012 [Genus Serpulina Stanton 1992] see Genus Brachyspira Hovind-Hougen et al. 1983 [Serpulina murdochii Stanton et al. 1997] see Brachyspira murdochii (Stanton et al. 1997) Hampson and La 2006