Heliothrix is a thermophile that is phylogenetically and phenotypically quite similar to
Chloroflexus except that it lacks the bacteriochlorophyll
c and chlorosomes of this organism.
Taken from the text Brock Biology of Microorganisms (10th ed.). Madigan, M.T., Martinko, J.M., and Parker, J. 2003. Prentice Hall. 440p.