Procaryotic Genera
   Domain "Bacteria" Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum Spirochaetes Garrity and Holt 2001 nom. inval. [monotypic] see Phylum Spirochaetota Garrity and Holt 2021
       Class "Spirochaetes" "Garrity and Holt 2001" nom. nud. [monotypic] see Class Spirochaetes Cavalier-Smith 2002 nom. rej.
         Order Spirochaetales Buchanan 1917 (Approved Lists 1980)
           Family "Serpulinaceae" "Garrity and Holt 2001" nom. nud. see Family Brachyspiraceae nom. ined.
             Genus Serpulina Stanton 1992 see Genus Brachyspira Hovind-Hougen et al. 1983