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 Spirochaetalesᵀ Buchanan 1917 (Approved Lists 1980) Family Spirochaetaceaeᵀ Swellengrebel 1907 (Approved Lists 1980) Genus Spirochaetaᵀ Ehrenberg 1835 (Approved Lists 1980) 01 Spirochaeta africana Zhilina et al. 1996 02 Spirochaeta alkalica Zhilina et al. 1996 03 Spirochaeta americana Hoover et al. 2003 04 Spirochaeta asiatica Zhilina et al. 1996 05 Spirochaeta aurantia (ex Vinzent 1926) Canale-Parola 1980 06 Spirochaeta bajacaliforniensis Fracek and Stolz 2004 07 Spirochaeta caldaria Pohlschroeder et al. 1995 08 Spirochaeta cellobiosiphila Breznak and Warnecke 2008 09 Spirochaeta coccoides Dröge et al. 2006 10 Spirochaeta halophila Greenberg and Canale-Parola 1977 (Approved Lists 1980) 11 Spirochaeta isovalerica Harwood and Canale-Parola 1983 12 Spirochaeta litoralis (ex Hespell and Canale-Parola 1970) Canale-Parola 1980 13 Spirochaeta plicatilisᵀ Ehrenberg 1835 (Approved Lists 1980) 14 Spirochaeta smaragdinae Magot et al. 1998 15 Spirochaeta stenostrepta Zuelzer 1912 (Approved Lists 1980) 16 Spirochaeta thermophila Aksenova et al. 1992 17 Spirochaeta zuelzerae (ex Veldkamp 1960) Canale-Parola 1980