 Examples of isolates include "Sulfurimonas autotrophica", "Sulfurimonas paralvinellae", "Sulfurovum lithotrophicum" and "Nautilia profundicola".A member of the class Epsilonproteobacteria occurs as an endosymbiont in the large gills of the deepwater sea snail "Alviniconcha hessleri".The Epsilonproteobacteria found at deep-sea hydrothermal vents characteristically exhibit chemolithotrophy, meeting their energy needs by oxidizing reduced sulfur, formate, or hydrogen coupled to the reduction of nitrate or oxygen.