[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990
     Phylum "Spirochaetes" Garrity and Holt 2001
       Class "Spirochaetes" Cavalier-Smith, 2002 see Class Spirochaetes Cavalier-Smith 2002
         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