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Microfauna are microscopic animals and organisms that exhibit animal-like qualities and have body sizes that are usually <0.1 mm. Microfauna are represented in the animal kingdom (e.g. nematodes, small arthropods) and some other heterotrophic, microscopic eukaryotes. A large amount of microfauna are soil microfauna which includes eukaryotic microbes, rotifers, and nematodes. These types of animal-like eukaryotic microbes and true animals are heterotrophic, largely feeding on bacteria. However, some microfauna can consume other things, making them detritivores, fungivores, or even predators.

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