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 Bacillatiᵀ (Gibbons and Murray 1978) Oren and Göker 2024
               Phylum Chloroflexota Garrity and Holt 2021
                 Class Anaerolineae Yamada et al. 2006
                   Order Aggregatilineales Nakahara et al. 2019
                     Family "Candidatus Flexifilaceae" Petriglieri et al. 2023 nom. pro-inval.
                       1 Genus "Candidatus Flexicrinis" Petriglieri et al. 2023 nom. pro-inval.
                       2 Genus "Candidatus Flexifilum"ᵀ Petriglieri et al. 2023 nom. pro-inval.