Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 1990 [paraphyletic?]
             Superphylum Terrabacteria Battistuzzi et al. 2004
               Phylum Chloroflexi Garrity and Holt 2001
                 Class Caldilineae Yamada et al. 2006 [monotypic]
                   Order Caldilinealesᵀ Yamada et al. 2006 [monotypic]
                     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