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Archaea

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Archaea ( ar-KEE-ə) 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 (sing. archaeon ar-KEE-on; from Ancient Greek ἀρχαῖον arkhaîon 'ancient') in English still generally refers specifically to prokaryotic members of Archaea.

Archaea Temporal range: Paleoarchean–Present 3420–0 Ma Pha. Proterozoic Archean Had. Composite image to illustrate the morphological diversity of Archaea. Left column, from top to bottom: Methanosarcina barkeri; Ignicoccus hospitalis with two smaller Nanoarchaeum equitans; an Archaeal Richmond Mine acidophilic nanoorganism (ARMAN); Haloquadratum walsbyi. Right column, from top to bottom: Methanohalophilus mahii; an artist's rendering of Pyrococcus furiosus; a model of Promethearchaeum syntrophicum; Halobacterium species NRC-1. Scientific classification Domain: Archaea Woese et al.…

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