[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 Methanococcaceae Balch and Wolfe 1981
             Genus Methanococcus Kluyver and van Niel 1936 (Approved Lists 1980)
               1 Methanococcus vannielii Stadtman and Barker 1951 (Approved Lists 1980)
               2 Methanococcus aeolicus Kendall et al. 2006
               3 Methanococcus maripaludis Jones et al. 1984
               4 Methanococcus voltae Balch and Wolfe 1981