| Archaea Temporal range: Archaean – Recent | |
|---|---|
| Halobacteria sp. strain NRC-1, each cell about 5 μm long. | |
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Haloarchaea are halophiles. They need high salt concentrations to grow. They are a distinct evolutionary branch of the Archaea, and are extremophiles.
The term halobacteria is a misnomer (mistaken name), because we now know the archaea are a different group from bacteria.

In taxonomy, the Haloarchaea are a class of the Euryarchaeota, found in water with salt. They are common in most environments where large amounts of salt, moisture, and organic material are available.