Picrophilus is an extremelyacidophilic genus withinEuryarchaeota. These microbes are the mostacidophilic organisms currently known,[3] with the ability to grow at a pH of less than 0.5.[4] They were first isolated from samples taken from acidic hot springs and dry hot soil inHokkaido (Japan). They are obligateacidophiles and are unable to maintain their membrane integrity at pH values above 4. While phylogenetically related to other organisms withinThermoplasmata, unlikeThermoplasma andFerroplasma,Picrophilus contains anS-layer cell wall.
^C.Michael Hogan. 2010.Extremophile. eds. E.Monosson and C.Cleveland. Encyclopedia of Earth. National Council for Science and the Environment, Washington DC.
Thuermer, Andrea; Voigt, Birgit; Angelov, Angel; Albrecht, Dirk; et al. (December 2011). "Proteomic analysis of the extremely thermoacidophilic archaeon Picrophilus torridus at pH and temperature values close to its growth limit".Proteomics.11 (23):4559–4568.doi:10.1002/pmic.201000829.PMID22114103.S2CID25035919.