Halophiles are extremophile organisms that thrive in environments with very high concentrations of salt. The name comes from Greek for "salt-loving". While the term's perhaps most often applied to some halophiles classified into the Archaea domain, there're also bacterial halophiles and some eukaryota, such as the alga Dunaliella salina. Some well-known species give off a red color from carotenoid compounds. Such species contain the photosynthetic pigment bacteriorhodopsin. Halophiles are catego… (More on Halophile)