In taxonomy, Thermococcus is a genus of extreme thermophiles in the family the Thermococcaceae.Members of the genus Thermococcus are all Archaea, having thermophillic-hyperthermophillic characteristics. These microorganisms are typically irregularly shaped coccoid species, ranging in size from 0.6-2.0 μm in diameter. Some species of Thermococcus are immobile, and some species have motility, using flagella as their main source of movement. These flagella typically exist at a specific pole of the organism. This movement has been seen at room temperature or at high temperature, depending on the specific organism. In some species, these microorganisms can aggregate and form white-gray plaques, while all of these organisms dwell in temperatures from 70-<100oC, either in the presence of black sm