[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990
     Phylum "Thermotogae" Reysenbach 2001
       Class Thermotogae Reysenbach 2002
         Order Thermotogales Reysenbach 2002
           Family Thermotogaceae Reysenbach 2002
             Genus Fervidobacterium Patel et al. 1985
               Fervidobacterium pennivorans corrig. Friedrich and Antranikian 1999