The anaerobe
Sygiolobus is a lobed coccus which grows between 57 and 89°C with an optimum temperature of 80°C.
Sygiolobus grows in acidic condition with an optimum pH of 3. The DNA is 38%GC.
Taken from the text Brock Biology of Microorganisms (10th ed.). Madigan, M.T., Martinko, J.M., and Parker, J. 2003. Prentice Hall. 464p.