Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 2024
             Kingdom Pseudomonadati (Gibbons and Murray 1978) Oren and Göker 2024
               Phylum Nitrospirota Garrity and Holt 2021
                 Class Nitrospiriaᵀ Garrity and Holt 2022 [monotypic]
                   Order Nitrospiralesᵀ Garrity and Holt 2022
                     Family Nitrospiraceaeᵀ Garrity and Holt 2022
                       Genus Leptospirillum (ex Markosyan 1972) Hippe 2000
                         Leptospirillum ferrooxidans (ex Markosyan 1972) Hippe 2000