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 Brevinematales Gupta et al. 2014
                     1 Family Brevinemataceaeᵀ Paster 2012 [monotypic]
                     2 Family Thermospiraceae Gam et al. 2023 [monotypic]
                     3 Family "Longinemataceae" corrig. Karnachuk et al. 2021 nom. inval. [monotypic]