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. 1990 [paraphyletic?]
             Phylum "Spirochaetes" Garrity and Holt 2001 [monotypic]
               Class Spirochaetesᵀ Cavalier-Smith 2002 [monotypic]
                 Order Spirochaetalesᵀ Buchanan 1917 (Approved Lists 1980), sedis mutabilis
                   Family Spirochaetaceaeᵀ Swellengrebel 1907 (Approved Lists 1980)
                     Genus Salinispira Ben Hania et al. 2015
                     [Genus Spirosymplokos Guerrero et al. 1993]
                     1.1 Genus Spirochaetaᵀ Ehrenberg 1835 (Approved Lists 1980)
                     1.2 Genus Sphaerochaeta Ritalahti et al. 2012
                     1.3 Genus Treponema Schaudinn 1905 (Approved Lists 1980)
                     2.1 Genus Clevelandina Bermudes et al. 1988 [monotypic]
                     2.2 Genus Diplocalyx (ex Gharagozlou 1968) Bermudes et al. 1988 [monotypic]
                     2.3 Genus Hollandina (ex To et al. 1978) Bermudes et al. 1988 [monotypic]
                     2.4 Genus Pillotina (ex Hollande and Gharagozlou 1967) Bermudes et al. 1988 [monotypic]