Alphaproteobacteria

Alphaproteobacteria
	Transmission electron micrograph of Wolbachia within an insect cell.; Credit:Public Library of Science / Scott O'Neill
Scientific classification
Domain:	Bacteria
Phylum:	Pseudomonadota
Class:	Alphaproteobacteria; Garrity et al. 2006
Subclasses and Orders
	Rickettsidae Ferla et al. 2013 Rickettsiales Gieszczykiewicz 1939 (Approved Lists 1980); "Pelagibacterales" Grote et al. 2012; ; Caulobacteridae Ferla et al. 2013 Caulobacterales Henrici and Johnson 1935 (Approved Lists 1980); Emcibacterales Iino et al. 2016; Holosporales Szokoli et al. 2020; Hyphomicrobiales Douglas 1957 (Approved Lists 1980); Iodidimonadales Iino et al. 2016; Kordiimonadales Kwon et al. 2005; Micropepsales Harbison et al. 2017; Parvularculales Garrity et al. 2003; Rhodobacterales Garrity et al. 2006; Rhodospirillales Pfennig and Trüper 1971 (Approved Lists 1980); Rhodothalassiales Venkata Ramana et al. 2014; Sneathiellales Kurahashi et al. 2008; Sphingomonadales Yabuuchi and Kosako 2006; ; "Taxa" incertae sedis (see text);
Synonyms
	Caulobacteria Cavalier-Smith 2020; Anoxyphotobacteria (Gibbons and Murray 1978) Murray 1988; Photobacteria Gibbons and Murray 1978 (Approved Lists 1980); Alphabacteria Cavalier-Smith 2002;

Alphaproteobacteria is a class of bacteria in the phylum Pseudomonadota (formerly "Proteobacteria"). The Magnetococcales and Mariprofundales are considered basal or sister to the Alphaproteobacteria. The Alphaproteobacteria are highly diverse and possess few commonalities, but nevertheless share a common ancestor. Like all Proteobacteria, its members are gram-negative, although some of its intracellular parasitic members lack peptidoglycan and are consequently gram variable.

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