Microorganisms
Existence

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

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Halobacterium

Korarchaeum

Methanopyrus

Nanoarchaeum

Nanoclepta

Nitrosopumilus

Nitrososphaera

Prometheoarchaeum

Sulfolobus

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