What is the largest group of Archaea?

Answer 1

Like bacteria, Archaea are single-celled organisms lacking nuclei. Most are cocci, bacilli, or spiral forms (although unusual shapes do exist). Unlike bacteria, Archaea lack peptidoglycan in their cell wall. At this point Archaea are not known to cause disease in humans or animals.

Members of the kingdom Archaea had been considered to be bacteria until examination of their unique rRNA sequences showed that they are a distinct type of prokaryote. And despite being prokaryotes, Archaea appear to be more closely related to Eukaryotes than to Bacteria.

This is the largest group of Archaea. Methanogens derive their name from the fact that methane is one of their metabolic byproducts.

The largest group of Archaea is methanogens.