prokaryotes - bacteria see Domain Bacteria Woese et al. 1990 stat. inval.
   Domain "Bacteria" Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum "Nitrospira" Garrity & Holt, 2001 [monotypic] see Phylum Nitrospirae Garrity and Holt 2001 nom. inval.
       Class "Nitrospira" "Garrity and Holt 2001" nom. nud. [monotypic] see Class Nitrospiria Garrity and Holt 2022
         Order "Nitrospirales" "Garrity and Holt 2001" nom. nud. [monotypic] see Order Nitrospirales Garrity and Holt 2022
           Family "Nitrospiraceae" "Garrity and Holt 2001" nom. nud. see Family Nitrospiraceae Garrity and Holt 2022
             1 Genus Leptospirillum (ex Markosyan 1972) Hippe 2000
             2 Genus Nitrospira Watson et al. 1986
             3 Genus Thermodesulfovibrio Henry et al. 1994