[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain "Archaea" Woese et al. 1990
     Phylum "Crenarchaeota" Garrity and Holt 2001
       Class Thermoprotei Reysenbach 2002
         Order Thermoproteales Zillig and Stetter 1982
           Family Thermoproteaceae Zillig and Stetter 1982
             Genus Pyrobaculum Huber et al. 1988
               1 Pyrobaculum islandicum Huber et al. 1988
               2 Pyrobaculum aerophilum Völkl et al. 1996
               3 Pyrobaculum arsenaticum Huber et al. 2001
               4 Pyrobaculum organotrophum Huber et al. 1988
               5 Pyrobaculum oguniense Sako et al. 2001