[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain "Archaea" Woese et al. 1990
     Phylum "Euryarchaeota" Garrity and Holt 2001
       Class Thermococci Zillig and Reysenbach 2002
         Order Thermococcales Zillig 1988
           Family Thermococcaceae Zillig 1988
             1 Genus Thermococcus Zillig 1983
             2 Genus Palaeococcus Takai et al. 2000
             3 Genus Pyrococcus Fiala and Stetter 1986