<tr><td>Kingdom:<td>Archaea
<tr><td>Phylum:<td>Crenarchaeota
<tr><td>Class:<td>Thermoprotei
</table>
<tr><th bgcolor=darkgray>Orders
<tr><td>
Caldisphaerales
Cenarchaeales
Desulfurococcales
Sulfolobales
Thermoproteales
</table>
The Crenarchaeota are a major group of Archaea, containing many extremely thermophilic organisms. They are separated from the other archaeans based mainly on rRNA sequences.
ja:クレンアーキオータ門
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