Concise hierarchy

(Kingdom) Thermoproteati - (Phylum) Thermoproteota - (Class) Thermoprotei

Subsequent positions

Thermoprotei (Class) Reysenbach 2001 nom. inval.

Ref: A.-L. Reysenbach, 2001: 198. [assumed]

Current position

Thermoprotei (Class) Reysenbach 2002

Ref: LPSN, 2020-present: [7 Dec 2025]; LPSN[7 Dec 2025].

Alternative positions

Crenarchaeota (Class) Cavalier-Smith 2002 nom. rej.	Ref: T. Cavalier-Smith, 2002a: tbl. 1 (p. 14). [new position]
Crenarchaeota (Kingdom) Woese et al. 1990
Sulfobacteria (Subphylum) (Cavalier-Smith 1986) Cavalier-Smith 1998	Ref: T. Cavalier-Smith, 1998: 219.
Thermoprotei (Class) Reysenbach 2001 nom. inval.	Ref: A.-L. Reysenbach, 2001: 198. [new position]

Historical positions

Thermoprotei (Class) Reysenbach 2002	Ref: J.P. Euzéby, 2016: [31 Aug 2017].
Thermoprotei (Class) Reysenbach 2002	Ref: M.A. Ruggiero et al., 2015b: table 2 (p. 2).
Thermoprotei (Class) Reysenbach 2002	Ref: G.M. Garrity et al., 2007: 9.
Crenarchaeota (Class) Cavalier-Smith 2002 nom. rej.	Ref: T. Cavalier-Smith, 2002a: tbl. 1 (p. 14). [new position]
Thermoprotei (Class) Reysenbach 2001 nom. inval.	Ref: G.M. Garrity et al., 2001b: 1. [new position]
Thermoprotei (Class) Reysenbach 2001 nom. inval.	Ref: A.-L. Reysenbach, 2001: 198; xiv. [new position]
Thermoprotei (Class) Reysenbach 2001 nom. inval.	Ref: G.M. Garrity & J.G. Holt, 2001a: 155. [new position]
Sulfobacteria (Subphylum) (Cavalier-Smith 1986) Cavalier-Smith 1998	Ref: T. Cavalier-Smith, 1998: table 2 (p. 219).

Number of Subtaxa

2026	Available in Systema Naturae 2000	1f;12g;19s
1989-present	Systema Naturae 2000: 7 Dec 2025	[1f;12g]
2016	J.P. Euzéby: [1 Sep 2017]	[1f;7g]
2007	G.M. Garrity et al.	[1f;6g;16s]
2001b	G.M. Garrity et al.: 1	[1f;6g]
2001	A.-L. Reysenbach	[1f;6g]
2001a	G.M. Garrity & J.G. Holt: 155	[1f;6g]
2000		1f6g