Concise hierarchy

(Kingdom) Methanobacteriati - (Phylum) Methanobacteriota - (Class) Methanobacteria

Subsequent positions

Methanobacteria (Class) Boone 2001 nom. inval.

Ref: D.R. Boone, 2001: 214. [assumed]

Current position

Methanobacteria (Class) Boone 2002

Ref: LPSN, 2020-present: [20 Nov 2025]; LPSN[20 Nov 2025].

Alternative positions

Euryarchaeota (Kingdom) Woese et al. 1990
Methanobacteria (Class) Boone 2001 nom. inval.	Ref: D.R. Boone, 2001: 214. [new position]
Methanothermea (Class) Cavalier-Smith 2002 nom. rej.	Ref: T. Cavalier-Smith, 2002a: tbl. 1 (p. 14). [new position]

Historical positions

Methanobacteria (Class) Boone 2002	Ref: J.P. Euzéby, 2016: [31 Aug 2017].
Methanobacteria (Class) Boone 2002	Ref: M.A. Ruggiero et al., 2015b: table 2 (p. 2).
Methanobacteria (Class) Boone 2002	Ref: G.M. Garrity et al., 2007: 10.
Methanothermea (Class) Cavalier-Smith 2002 nom. rej.	Ref: T. Cavalier-Smith, 2002a: tbl. 1 (p. 14). [new position]
Methanobacteria (Class) Boone 2001 nom. inval.	Ref: G.M. Garrity et al., 2001b: 1. [new position]
Methanobacteria (Class) Boone 2001 nom. inval.	Ref: D.R. Boone, 2001: 214; xiv. [new position]
Methanobacteria (Class) Boone 2001 nom. inval.	Ref: G.M. Garrity & J.G. Holt, 2001a: 155. [new position]

Number of Subtaxa

2026	Available in Systema Naturae 2000	2f;9g;50s
1989-present	Systema Naturae 2000: 20 May 2026	[2f;9g]
2016	J.P. Euzéby: [6 Sep 2017]	[2f;5g]
2007	G.M. Garrity et al.	[2f;5g;35s]
2001b	G.M. Garrity et al.: 1	[2f;5g]
2001	D.R. Boone	[2f;5g]
2001a	G.M. Garrity & J.G. Holt: 155	[2f;5g]
2000		2f5g