Concise hierarchy

(Kingdom) Bacillati - (Phylum) Bacillota - (Class) Clostridia - (Order) Eubacteriales

Current position

Eubacteriales (Order) Buchanan 1917 (Approved Lists 1980)

Ref: LPSN, 2020-present: [1 Jan 2026]; LPSN[1 Jan 2026].

Alternative positions

Clostridiales (Order) Prévot 1953 (Approved Lists 1980)	Ref: J.P. Euzéby, 2016: [4 Sep 2017].
Endospora (Phylum)	Ref: L. Margulis & K.V. Schwartz, 1998: 93. [rough position]
Gram-positive cocci ([unranked])	Ref: J.O. Mundt, 1982: 36.

Historical positions

Clostridiales (Order) Prévot 1953 (Approved Lists 1980)	Ref: J.P. Euzéby, 2016: [4 Sep 2017].
Clostridiales (Order) Prévot 1953 (Approved Lists 1980)	Ref: G.M. Garrity et al., 2007: 297.
Clostridiales (Order) Prévot 1953 (Approved Lists 1980)	Ref: G.M. Garrity et al., 2001b: 16.
Clostridiales (Order) Prévot 1953 (Approved Lists 1980)	Ref: G.M. Garrity & J.G. Holt, 2001a: 162.
Endospora (Phylum)	Ref: L. Margulis & K.V. Schwartz, 1998: 93. [rough position]
Gram-positive cocci ([unranked])	Ref: J.O. Mundt, 1982: 36.
Grampositieve coccen ([unranked])	Ref: L.J. Audus & V. Heywood, 1981: 139.

Number of Subtaxa

2026	Available in Systema Naturae 2000	30g;43s;2ss
1989-present	Systema Naturae 2000: 1 Jan 2026	[30g]
2016	J.P. Euzéby: [9 Sep 2017]	[15g]
2007	G.M. Garrity et al.	[10g;40s;2ss]
2001b	G.M. Garrity et al.: 17	[17g]
2001a	G.M. Garrity & J.G. Holt: 162	[17g]
2000		17g
1998	L. Margulis & K.V. Schwartz	3g
1982	J.O. Mundt	4g