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
Phylum: Euryarchaeota

Korarchaeum
Phylum: Korarchaeota

Methanopyrus
Phylum: Euryarchaeota

Nanoarchaeum
Phylum: Nanoarchaeota

Nanoclepta
Phylum: Nanoarchaeota

Nitrosopumilus
Phylum: Thaumarchaeota

Nitrososphaera
Phylum: Thaumarchaeota

Prometheoarchaeum
Phylum: Lokiarchaeota

Sulfolobus
Phylum: Crenarchaeota

Thermoproteus
Phylum: Crenarchaeota
 
      Extinct Life= Extinct Life Forms   Exsistent Life= Living Creatures   Exsistent Life= Fictional Beasts   Inanimate Objects= Inanimate Objects   Ethereal Entities= Ethereal Entities