Archaea (Taxonomic Rank: Kingdom)
Single-celled microorganisms which thrive in high temperatures and/or in extremely alkaline or acid waters.

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	Aenigmarchaeum Caldarchaeum Halobacterium Iainarchaeum Methanopyrus

= Extinct Life Forms   = Living Creatures   = Fictional Beasts   = Inanimate Objects   = Ethereal Entities    = At least one collectible is catalogued