The Archaea represent one of the three domains of life and are distinguished from the Bacteria and Eukarya phylogenetically and biochemically. As a group, the Archaea are physiologically diverse and inhabit a wide range of ecosystems, including the most extreme environments on Earth, where they contribute to global energy cycles.
Keywords: Archaea; Crenarchaeota; Euryarchaeota; thermophiles; halophiles; methanogens








