Epsilonproteobacteria
Campylobacter
Scientific classification
Domain:	Bacteria
Phylum:	Proteobacteria
Class:	Epsilonproteobacteria
Orders
Nautiliales Nautiliaceae Caminibacter Lebetimonas Nautilia Nitratifractor Nitratiruptor Thioreductor Campylobacterales Hydrogenimonadaceae Hydrogenimonas Campylobacteraceae 'Candidatus Thioturbo' Arcobacter Campylobacter Sulfurospirillum Helicobacteraceae Helicobacter Sulfuricurvum Sulfurimonas Sulfurovum Thiovulum Wolinella

Epsilonproteobacteria is a class of Proteobacteria.^[1] All species of this class are, like all Proteobacteria, gram-negative.

The Epsilonproteobacteria consist of few known genera, mainly the curved to spirilloid Wolinella spp., Helicobacter spp., and Campylobacter spp. Most of the known species inhabit the digestive tract of animals and serve as symbionts (Wolinella spp. in cows) or pathogens (Helicobacter spp. in the stomach, Campylobacter spp. in the duodenum).

There have also been numerous environmental sequences of Epsilonproteobacteria recovered from hydrothermal vents and cold seep habitats. A member of the class Epsilonproteobacteria occurs as an endosymbiont in the large gills of the deep water sea snail Alviniconcha hessleri.^[2]

Often the epsilonproteobacteria living in hydrothermal deep sea-vents exhibit chemolithotrophic features, and they are able to meet their energy needs by reducing or oxidixing chemical compounds.^[3]

Phylogeny[link]

The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN) ^[4] and National Center for Biotechnology Information (NCBI)^[5] and the phylogeny is based on 16S rRNA-based LTP release 106 by 'The All-Species Living Tree' Project ^[6]

Notes:
♪ Prokaryotes where no pure (axenic) cultures are isolated or available, i. e. not cultivated or can not be sustained in culture for more than a few serial passages

References[link]

External links[link]

• Epsilonproteobacteria at the US National Library of Medicine Medical Subject Headings (MeSH)