Class Alphaproteobacteria

Warning: In the List of Prokaryotic names with Standing in Nomenclature, an arrow () only indicates the sequence of valid publication of names and does not mean that the last name in the sequence must be used (see: Introduction).

Classification (Warning: see also the file "Classification of prokaryotes: Introduction").

For a detailed description of this taxon see Bergey’s Manual of Systematics of Archaea and Bacteria (BMSAB).


Alphaproteobacteria Garrity et al. 2006, class. nov.
Type order: ¤ Caulobacterales Henrici and Johnson 1935 (Approved Lists 1980).
Etymology: Gr. n. alpha, name of the first letter of Greek alphabet; Gr. or L. n. Proteus, Greek god of the sea, capable of assuming many different shapes; N.L. n. bacter, a rod; suff. -ia, ending to denote a class; N.L. neut. pl. n. Alphaproteobacteria, a class of bacteria included in the phylum "Proteobacteria" and having 16S rRNA gene sequences related to those of the members of the order Caulobacterales.
Valid publication: Validation List no. 107. Int. J. Syst. Evol. Microbiol., 2006, 56, 1-6.
Effective publication: GARRITY (G.M.), BELL (J.A.) and LILBURN (T.): Class I. Alphaproteobacteria class. nov. In: D.J. BRENNER, N.R. KRIEG, J.T. STALEY and G. M. GARRITY (editors), Bergey's Manual of Systematic Bacteriology, second edition, vol. 2 (The Proteobacteria), part C (The Alpha-, Beta-, Delta-, and Epsilonproteobacteria), Springer, New York, 2005, p. 1.
Validation List no. 107 in IJSEM Online