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 Spirochaetota Garrity and Holt 2021
                 Class Spirochaetiaᵀ Paster 2020
                   Order Leptospirales Gupta et al. 2014 [monotypic]
                     Family Leptospiraceaeᵀ Hovind-Hougen 1979 (Approved Lists 1980)
                       1 Genus Leptonema Hovind-Hougen 1983 nom. illeg. [monotypic]
                       2 Genus Leptospiraᵀ Noguchi 1917 (Approved Lists 1980)
                       3 Genus Turneriella Levett et al. 2005 [monotypic]