Concise hierarchy

(Kingdom) Pseudomonadati - (Phylum) Pseudomonadota - (Class) Betaproteobacteria - (Order) Spirillales

Current position

Spirillales (Order) Prévot 1940 (Approved Lists 1980)

Ref: LPSN, 2020-present: [28 Apr 2026]; LPSN[28 Apr 2026].

Alternative positions

Nitrosomonadales (Order) Garrity et al. 2006 nom. illeg.	Ref: J.P. Euzéby, 2016: [5 Sep 2017].
Nitrosomonadales (Order) "Garrity and Holt 2001" nom. nud.	Ref: G.M. Garrity et al., 2001b: 10.
Spiral and curved bacteria ([unranked])	Ref: N.R. Krieg, 1982: 30.

Historical positions

Nitrosomonadales (Order) Garrity et al. 2006 nom. illeg.	Ref: J.P. Euzéby, 2016: [5 Sep 2017].
Nitrosomonadales (Order) Garrity et al. 2006 nom. illeg.	Ref: G.M. Garrity et al., 2007: 144.
Nitrosomonadales (Order) "Garrity and Holt 2001" nom. nud.	Ref: G.M. Garrity et al., 2001b: 10.
Nitrosomonadales (Order) "Garrity and Holt 2001" nom. nud.	Ref: G.M. Garrity & J.G. Holt, 2001a: 159.
Spiral and curved bacteria ([unranked])	Ref: N.R. Krieg, 1982: 30.
Spiraalvormige of gekromde bacteriën ([unranked])	Ref: L.J. Audus & V. Heywood, 1981: 138.

Number of Subtaxa

2026	Available in Systema Naturae 2000	3g;2s
1989-present	Systema Naturae 2000: 28 Apr 2026	[3g]
2016	J.P. Euzéby: [12 Sep 2017]	[1g]
2007	G.M. Garrity et al.	[1g;1s]
2001b	G.M. Garrity et al.: 10	[1g]
2001a	G.M. Garrity & J.G. Holt: 159	[1g]
2000		1g
1982	N.R. Krieg	4g