[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 Methanococci Boone 2002
         Order Methanococcales Balch and Wolfe 1981
           Family Methanocaldococcaceae Whitman et al. 2002
             Genus Methanocaldococcus Whitman 2002
               Methanocaldococcus vulcanius (Jeanthon et al. 1999) Whitman 2002