microfauna

This term is used primarily in scientific and ecological contexts to describe a community of organisms. It functions as a collective noun, referring to the entire assemblage of microscopic animals rather than individual creatures.

Because it describes a collective group, the word is treated as uncountable. It does not have a plural form in standard scientific usage; instead, researchers refer to the "composition" or "diversity" of the microfauna to describe various types of organisms within that group.