“…The Bacteria domain is dominated by Epsilonproteobacteria detected in hydrothermal fluids, in sea water, hydrothermal sediments, microbial mats and in association with macrofauna (Reysenbach et al 2000(Reysenbach et al , 2002Alain et al 2002b;Teske et al 2002;Huber et al 2003;Page et al 2004;Suzuki et al 2005;Campbell et al 2006;Gerasimchuk et al 2010;Crépeau et al 2011;Sylvan et al 2012); other bacterial groups were also detected, such as Alpha-, Beta-, Delta and Gammaproteobacteria, Aquificales, Desulfobacteriales, Thermotogales, Deinococcus-Thermus, Deferribacteres, Firmicutes, CFB (Cytophaga-Flavobacteria-Bacteroidetes), Acidobacteria, Verrumicrobia and Planctomycetes (Alain et al 2002a;Reysenbach et al 2002;Teske et al 2002;Huber et al 2003;Page et al 2004;Cré-peau et al 2011;Orcutt et al 2011;Sylvan et al 2012). More than one hundred species of Bacteria (17 phyla, 72 genera, 113 species) and Archaea (3 phyla, 17 genera and 62 species) were isolated and cultured from deep-sea hydrothermal vents, mainly from the Pacific ocean (69-77 % of species) and, in lesser numbers, from the Atlantic (19-28 % of species) and Indian (2-4 % of species) Oceans.…”