Archaea ( ) is a domain of organisms. Traditionally, Archaea included only its prokaryotic members, but has since been found to be paraphyletic, as eukaryotes are known to have evolved from archaea. Even though the domain Archaea cladistically includes eukaryotes, the term archaea ( ; ) in English still generally refers specifically to prokaryotic members of Archaea.
Archaea is a domain of single-celled organisms that were originally thought to be prokaryotes distinct from bacteria, though scientists have discovered that eukaryotes (including all animals, plants, and fungi) actually evolved from archaea. Today, the term "archaea" typically refers to the prokaryotic members of this group, even though technically eukaryotes are also part of the archaea domain from an evolutionary standpoint.
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Archaea ( ) is a domain of organisms. Traditionally, Archaea included only its prokaryotic members, but has since been found to be paraphyletic, as eukaryotes are known to have evolved from archaea. Even though the domain Archaea cladistically includes eukaryotes, the term archaea ( ; ) in English still generally refers specifically to prokaryotic members of Archaea.
Archaea were initially classified as bacteria, receiving the name archaebacteria (, in the Archaebacteria kingdom), but this term has fallen out of use. Archaeal cells have unique properties distinguishing them from Bacteria and Eukaryota, including: cell membranes made of ether-linked lipids; metabolisms such as methanogenesis; and a unique motility structure known as an archaellum. Archaea are further divided into multiple recognized phyla. Classification is difficult because most have not been isolated in a laboratory and have been identified only by their gene sequences in environmental samples. It is unknown whether they can produce endospores.
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