Methanospirillaceae Boone et al. 2002 Methanospirillum Ferry et al. 1974 (Approved Lists 1980) emend. Zhou et al. 2014 Universal Root Woese et al. 1990 Archaea Woese et al. 1990 Euryarchaeota (sic) Garrity and Holt 2001 Methanobacteriota corrig. Garrity and Holt 2001 Methanococci Boone 2002 Methanomicrobiales Balch and Wolfe 1981 Methanospirillaceae Boone et al. 2002 Methanomicrobiales Balch and Wolfe 1981 Methanocorpusculaceae Zellner et al. 1989 Methanomicrobiaceae Balch and Wolfe 1981 Methanoplanaceae Wildgruber et al. 1984 Methanoregulaceae Sakai et al. 2012 Methanocalculaceae Zhilina et al. 2014 Methanosarcinaceae Balch and Wolfe 1981 emend. Sowers et al. 1984 Incertae sedis 1 Garrity et al. 2007 Methanospirillum Ferry et al. 1974 (Approved Lists 1980) emend. Zhou et al. 2014 Boone D.R. Whitman W.B. Koga Y. Garrity G.M. Boone D.R. Castenholz R.W. Order II. Methanomicrobiales ord. nov. 2001 1 2 246 Bergey's Manual of Systematic Bacteriology Springer New York Boone D.R. Whitman W.B. Koga Y. Garrity G.M. Boone D.R. Castenholz R.W. Family III. Methanospirillaceae fam. nov. 2001 1 2 264 Bergey's Manual of Systematic Bacteriology Springer New York