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 Caldilineae Yamada et al. 2006 [monotypic]
                   Order Caldilinealesᵀ Yamada et al. 2006
                     Family Caldilineaceae Yamada et al. 2006
                       Genus Caldilineaᵀ Sekiguchi et al. 2003
                         1 Caldilinea aerophilaᵀ Sekiguchi et al. 2003
                         2 Caldilinea tarbellica Grégoire et al. 2011