Members of the Archaea comprise one of the three principal domains of living organisms in the universal phylogenetic tree of life. The other two principal domains are the Bacteria and the Eukarya. The phylogenetic tree is a theoretical representation...

At first glance, members of domain Archaea look very much like Bacteria in morphology, but biochemical and evolutionary studies have shown that they are a unique branch of life, separate from Bacteria (Eubacteria) and Eukaryotes. This was first...

Genes that code for vital cellular functions are highly conserved through evolutionary time, and because even these genes experience random changes over time, the comparison of such genes allows the relatedness of different organisms to be assessed....

A group of prokaryotes whose members differ from bacteria, the most prominent prokaryotes, in certain physical, physiological, and genetic features. The archaea may be aquatic or terrestrial microorganisms. They exhibit a diversity of shapes, including...

Crenarchaeota Euryarchaeota Korarchaeota Nanoarchaeota...