Sulfolobus is a genus of microorganism in the family Sulfolobaceae. It belongs to the archea domain. Sulfolobus species grow in volcanic springs with optimal growth occuring at pH 2-3 temperatures of 75-80C, making them acidophiles and thermophiles respectively. Sulfolobus cells are irregularly shaped and flagellar. Species of Sulfolobus are generally named after the location from which they were first isolated. Sulfolobus solfataricus was first isolated in the Solfatara volcano. Other species can be found throughout the world in areas of volcanic or geothermal activity, such as geological formations called mud pots, which are also known as solfatare.