Domain Bacteria Woese et al. 1990
   Phylum Nitrospirae Garrity and Holt 2001
     Class "Nitrospira" 2001
       Order "Nitrospirales" 2001
         Family "Nitrospiraceae" 2001
           Genus Leptospirillum (ex Markosyan 1972) Hippe 2000
           Genus Magnetobacterium Murray and Stackebrandt 1995
           Genus Thermodesulfovibrio Henry et al. 1994
           1 Genus Nitrospira Watson et al. 1986