microfaunae

/ˌmaɪkroʊˈfɔːniː/
noun
  1. Plural form of microfauna; very small animals that can only be seen with a microscope.
    • The soil sample contained diverse microfaunae, including rotifers and tardigrades.
    • Researchers cataloged the microfaunae living on the ocean floor.
    • Different microfaunae thrive in freshwater versus saltwater environments.