[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 Methanobacteria Boone 2002 Order Methanobacteriales Balch and Wolfe 1981 Family Methanothermaceae Stetter 1982 1 Genus Methanothermus Stetter 1982