[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum "Spirochaetes" Garrity and Holt 2001 nom. inval. see Phylum Spirochaetota Garrity and Holt 2021
       Class "Spirochaetes" "Garrity and Holt 2001" nom. nud. see Class Spirochaetes Cavalier-Smith 2002 nom. rej.
         Order Spirochaetales Buchanan 1917 (Approved Lists 1980)
           Family Spirochaetaceae Swellengrebel 1907 (Approved Lists 1980)
             1 Genus Spirochaeta Ehrenberg 1835 (Approved Lists 1980)
             2 Genus Borrelia Swellengrebel 1907 (Approved Lists 1980)
             3 Genus Brevinema Defosse et al. 1995
             4 Genus Clevelandina Bermudes et al. 1988
             5 Genus Cristispira Gross 1910 (Approved Lists 1980)
             6 Genus Diplocalyx (ex Gharagozlou 1968) Bermudes et al. 1988
             7 Genus Hollandina (ex To et al. 1978) Bermudes et al. 1988 nom. illeg.
             8 Genus Pillotina (ex Hollande and Gharagozlou 1967) Bermudes et al. 1988
             9 Genus Treponema Schaudinn 1905 (Approved Lists 1980)