[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum Nitrospira Garrity & Holt, 2001 see Phylum Nitrospirae Garrity and Holt 2001 nom. inval.
       Class "Nitrospira" "Garrity and Holt 2001" nom. nud. see Class Nitrospiria Garrity and Holt 2022
         Order "Nitrospirales" "Garrity and Holt 2001" nom. nud. see Order Nitrospirales Garrity and Holt 2022
           Family "Nitrospiraceae" "Garrity and Holt 2001" nom. nud. see Family Nitrospiraceae Garrity and Holt 2022
             Genus Leptospirillum (ex Markosyan 1972) Hippe 2000
               1 Leptospirillum ferrooxidans (ex Markosyan 1972) Hippe 2000
               2 Leptospirillum ferriphilum Coram and Rawlings 2002
               3 Leptospirillum thermoferrooxidans Hippe 2000