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 Thermoflexia Dodsworth et al. 2014 [monotypic]
                 1 Class Ardenticatenia Kawaichi et al. 2013 [monotypic]
                 2 Class Ktedonobacteria corrig. Cavaletti et al. 2007
                 3 Class Chloroflexiaᵀ Gupta et al. 2013
                 4.1 Class Anaerolineae Yamada et al. 2006 [monotypic]
                 4.2 Class Caldilineae Yamada et al. 2006 [monotypic]
                 5 Class Thermomicrobia Garrity and Holt 2002