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) 01 Genus Alkalispirochaeta Sravanthi et al. 2016 02 Genus Bullifex Wylensek et al. 2021 03 Genus Clevelandina Bermudes et al. 1988 [monotypic] 04 Genus Diplocalyx (ex Gharagozlou 1968) Bermudes et al. 1988 [monotypic] 05 Genus Entomospira Graña-Miraglia et al. 2024 06 Genus Hollandina (ex To et al. 1978) Bermudes et al. 1988 nom. illeg. [monotypic] 07 Genus Marispirochaeta Shivani et al. 2017 08 Genus Oceanispirochaeta Subhash and Lee 2017 09 Genus Pillotina (ex Hollande and Gharagozlou 1967) Bermudes et al. 1988 [monotypic] 10 Genus Rarispira Podosokorskaya et al. 2025 11 Genus Salinispira Ben Hania et al. 2015 12 Genus Sediminispirochaeta Shivani et al. 2016 13 Genus Spirochaetaᵀ Ehrenberg 1835 (Approved Lists 1980) 14 Genus Thiospirochaeta Dubinina et al. 2020 15 Genus "Canaleparolina" Wier et al. 2000 nom. inval. 16 Genus "Mobilifilum" Margulis et al. 1990 nom. inval. 17 Genus "Candidatus Allospironema" corrig. Paster and Dewhirst 2020 18 Genus "Candidatus Haliotispira" Sharma et al. 2024 nom. pro-inval. 19 Genus "Candidatus Thalassospirochaeta" Pragya et al. 2024 nom. pro-inval.