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
                   1 Genus Flexilinea Sun et al. 2016, incertae sedis
                   2 Genus Thermanaerothrix Grégoire et al. 2025, incertae sedis
                   3 Genus Thermomarinilinea Nunoura et al. 2013, incertae sedis
                   4 Genus "Candidatus Pachofilum" Petriglieri et al. 2023 nom. pro-inval., incertae sedis
                   5 Family "Candidatus Profundisolitariaceae" Mehrshad et al. 2021 [monotypic]
                   6 Order Aggregatilineales Nakahara et al. 2019
                   7 Order Anaerolinealesᵀ Yamada et al. 2006
                   8 Order "Candidatus Epilineales" Petriglieri et al. 2023 nom. pro-inval. [monotypic]
                   9 Order "Candidatus Promineifilales" Chuvochina et al. 2023 nom. pro-inval. [monotypic]