Infauna

Part of speech: noun

Definitions

1. A specific category of organisms that dwell underground in marine or freshwater sediments plays a crucial role in ecological processes
2. This term describes the various organisms living buried within sediment in aquatic environments, influencing nutrient dynamics and habitat structure
3. A group of organisms residing within the sediment of aquatic ecosystems, significantly impacting the nutrient cycles and overall ecosystem health

Etymology: Infauna is a compound built from the Latin prefix "in-" meaning "within" and "fauna," the collective word for animals. The pairing was coined in the 1950s by ecologists studying life on the seabed, who needed a term for animals that live buried inside sediment rather than on its surface. The contrasting term "epifauna," from Greek "epi-" meaning "upon," describes creatures that crawl or sit on top of the bottom. The coinage follows the logic of the older word "fauna" itself, which the Romans borrowed from the name of the Roman rural deity Faunus, a god of fields, woods, and flocks. Scientists took that deity's name and attached a prefix to mark a precise habitat, so the word describes where an animal lives as much as what it is.

Synonyms: benthic fauna