noun, plural microfaunas, microfaunae [mahy-kroh-faw-nee] . (used with a singular or plural verb)
Biology. microscopic animals.
Ecology. the fauna of a microhabitat.

1900–05; micro- + fauna

microfaunal, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica


small, often microscopic animals, especially those inhabiting the soil, an organ, or other localized habitat. Single-celled protozoans, small nematodes, small unsegmented worms, and tardigrades (eight-legged arthropods) are the most common components of microfauna. Many inhabit water films or pore spaces in leaf litter and in the soil, feeding on smaller microorganisms that decompose organic material.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Combined, all these creatures are called marine microfauna.
Common to abundant microfauna in the subsurface are not present in outcrop.
Chemicals contained in the microfauna eaten by the frogs are excreted through
  their vibrant skins.
Zooplankton are microscopic animals, also called microfauna, that feed on
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