[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 "Brachyspiraceae" nom. ined. see Family Brachyspiraceae Paster 2012
             Genus Brachyspira Hovind-Hougen et al. 1983
               1 Brachyspira aalborgi Hovind-Hougen et al. 1983
               2 Brachyspira alvinipulli Stanton et al. 1998
               3 Brachyspira hyodysenteriae (Harris et al. 1972) Ochiai et al. 1998
               4 Brachyspira innocens (Kinyon and Harris 1979) Ochiai et al. 1998
               5 Brachyspira intermedia (Stanton et al. 1997) Hampson and La 2006
               6 Brachyspira murdochii (Stanton et al. 1997) Hampson and La 2006
               7 Brachyspira pilosicoli (Trott et al. 1996) Ochiai et al. 1998