Archaebacteria: Ancient (over 3.5 billion years old) group of prokaryotes; some biologists want to place this group into a separate Kingdom, the Archaea. Most currently place it within the Kingdom Monera.

 

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Archaebacteria: Ancient (over 3.5 billion years old) group of prokaryotes; some biologists want to place this group into a separate Kingdom, the Archaea. Most currently place it within the Kingdom Monera.

Thermacidophiles: A group of archaebacteria that are able to tolerate high temperatures and acidic pH.

Monera: Prokaryotic kingdom that includes (in the most widely accepted classification system) archaebacteria, eubacteria, and cyanobacteria. Members of this kingdom were among the first forms of lif . . . View Full Definition

Methanogens: A group of archaebacteria that produce methane as a by product of their metabolism.

Halophiles: A group of archaebacteria that are able to tolerate high salt concentrations.

Archaea: Proposed, but not widely accepted, sixth taxonomic kingdom that would include the archaebacteria.