Micro-animals are animals that are microscopic and thus cannot be seen with the naked eye and can only be observed under a microscope. Mostly these microorganisms are multicellular but none are vertebrates. Microscopic arthropods include dust mites, spider mites, and some crustaceans such as copepods and the cladocera. Another common group of microscopic animals are the rotifers, which are filter feeders that are usually found in fresh water. Some nematode species are microscopic, as well as many loricifera, including the recently discovered anaerobic species, which spend their entire lives in an anoxic environment.
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