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Taxon: Class Alphaproteobacteria Garrity et al. 2006 (prokaryote)
 Entity: 

Concise hierarchy

(Kingdom) Pseudomonadati - (Phylum) Pseudomonadota

Current position

Pseudomonadota (Phylum) Garrity et al. 2021 Ref: LPSN, 2020-present: [17 Apr 2026]; LPSN[17 Apr 2026].

Alternative positions

Proteobacteria (Phylum) Garrity et al. 2005 stat. inval. Ref: J.P. Euzéby, 2016: [31 Aug 2017] [Hug et al., 2016: fig. 1].

Historical positions

Proteobacteria (Phylum) Garrity et al. 2005 stat. inval. Ref: J.P. Euzéby, 2016: [31 Aug 2017].
Bacteria (Domain) Woese et al. 1990 stat. inval. Ref: L.A. Hug et al., 2016: fig. 1; 4. [rough position]
Proteobacteria (Phylum) Garrity et al. 2005 stat. inval. Ref: M.A. Ruggiero et al., 2015b: table 2 (p. 5).
Proteobacteria (Phylum) Garrity et al. 2005 stat. inval. Ref: G.M. Garrity et al., 2007: 52.

Number of Subtaxa

2026 Available in Systema Naturae 2000 21o;94f;774g;1142s;25ss
1989-present Systema Naturae 2000: 25 Apr 2026 [21o;94f;774g]
2016 J.P. Euzéby: [11 Sep 2017] [11o;30f;390g]
2015b M.A. Ruggiero et al.: table 2 (p. 5) [11o]
2007 G.M. Garrity et al. [8o;21f;197g;629s;23ss]
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Last updated: 28 Aug 2026