Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
   Phylum Nitrospirae Garrity and Holt 2001 nom. inval. see Phylum Nitrospirota Garrity and Holt 2021
     1 Class "Nitrospira" "Garrity and Holt 2001" nom. nud. see Class Nitrospiria Garrity and Holt 2022