Micro-animal

Micro-animals are animals so small that they can be visually observed only under a microscope. Unlike most other microorganisms that are unicellular, micro-animals are unique because they are multicellular like all other animals.

A microscopic arachnid Lorryia formosa

Notable phyla include:

Microscopic arthropods, including dust mites, spider mites, and some crustaceans such as copepods and certain cladocera.
Tardigrades
Rotifers, which are filter feeders that are usually found in fresh water.
Some nematode species[1]
Many loricifera, including the recently discovered anaerobic species, which spend their entire lives in an anoxic environment.[2][3]

References

"Microscopic Animals". Natural Recources Conservation Service. Archived from the original on 2010-03-05. Retrieved 2010-04-16.
Fang, Janet (6 April 2010). "Animals thrive without oxygen at sea bottom". Nature. 464 (7290): 825. doi:10.1038/464825b. PMID 20376121.
"Briny deep basin may be home to animals thriving without oxygen". Science News. 9 April 2010.

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[1] "Microscopic Animals". Natural Recources Conservation Service. Archived from the original on 2010-03-05. Retrieved 2010-04-16.

[2] Fang, Janet (6 April 2010). "Animals thrive without oxygen at sea bottom". Nature. 464 (7290): 825. doi:10.1038/464825b. PMID 20376121.

[3] "Briny deep basin may be home to animals thriving without oxygen". Science News. 9 April 2010.