[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 Spirochaetaceae Swellengrebel 1907 (Approved Lists 1980)
             Genus Treponema Schaudinn 1905 (Approved Lists 1980)
               01 Treponema pallidum (Schaudinn and Hoffmann 1905) Schaudinn 1905 (Approved Lists 1980)
               02 Treponema amylovorum Wyss et al. 1997
               03 Treponema azotonutricium Graber et al. 2004
               04 Treponema berlinense Nordhoff et al. 2005
               05 Treponema brennaborense Schrank et al. 1999
               06 Treponema bryantii Stanton and Canale-Parola 1980
               07 Treponema denticola (ex Flügge 1886) Chan et al. 1993
               08 Treponema lecithinolyticum Wyss et al. 1999
               09 Treponema maltophilum Wyss et al. 1996
               10 Treponema medium Umemoto et al. 1997
               11 Treponema minutum Dobell 1912 (Approved Lists 1980)
               12 Treponema paraluiscuniculi corrig. (Jacobsthal 1920) Smibert 1974 (Approved Lists 1980)
               13 Treponema parvum Wyss et al. 2001
               14 Treponema pectinovorum Smibert and Burmeister 1983
               15 Treponema pertenue (Castellani 1905) Castellani and Chalmers 1910 (Approved Lists 1980)
               16 Treponema porcinum Nordhoff et al. 2005
               17 Treponema primitia Graber et al. 2004
               18 Treponema putidum Wyss et al. 2004
               19 Treponema saccharophilum Paster and Canale-Parola 1986
               20 [Treponema socranskii] Smibert et al. 1984
               21 Treponema succinifaciens Cwyk and Canale-Parola 1981