Halophile An organism requiring at least 0.2 M concentrations of salt ( NaCl ) for growth Hyperthermophile An organism that can thrive at temperatures between 80-122 ° C , such as those found in hydrothermal systems Hypolith An organism that lives underneath rocks in cold deserts Lithoautotroph An organism ( usually bacteria ) whose sole source of carbon is carbon dioxide and exergonic inorganic oxidation ( chemolithotrophs ) such as Nitrosomonas europaea ; these organisms are capable of deriving energy from reduced mineral compounds like pyrites , and are active in geochemical cycling and the weathering of parent bedrock to form soil Metallotolerant capable of tolerating high levels of dissolved heavy metals in solution , such as copper , cadmium , arsenic , and zinc ; examples include Ferroplasma sp . , Cupriavidus metallidurans and GFAJ-1 .
Acidophiles An organism with optimal growth at pH levels of 3 or below Alkaliphiles An organism with optimal growth at pH levels of 9 or above Endoliths An organism that lives in microscopic spaces within rocks , fissures , aquifers , and faults filled with groundwater in the deep subsurface Halophiles An organism requiring at least 0.2 molar concentrations of salt ( NaCl ) for growth Hyperthermophile An organism that can thrive at temperatures between 80-122 ° C , such as those found in hydrothermal systems Hypoliths An organism that lives inside rocks in cold deserts Lithoautotrophs An organism ( usually bacteria ) whose sole source of carbon is carbon dioxide and exergonic inorganic oxidation ( chemolithotrophs ) such as Nitrosomonas europaea ; these organisms are capable of deriving energy from reduced mineral compounds like pyrites , and are active in geochemical cycling and the weathering of parent bedrock to form soil Metalotolerant capable of tolerating high levels of dissolved heavy metals in solution , such as copper , cadmium , arsenic , and zinc ; examples include Ferroplasma sp .