Epifauna refers to animals that live on the surface of the seabed or attached to underwater structures, such as rocks, corals, and shipwrecks. These organisms can include a variety of species, such as crabs, sea stars, and barnacles. They play a crucial role in marine ecosystems by contributing to nutrient cycling and providing habitat for other marine life. Epifauna can be found in various marine environments, from shallow coastal areas to deep-sea habitats. Their presence can indicate the health of an ecosystem, as they are often sensitive to changes in water quality and habitat conditions. Understanding epifauna helps scientists monitor and protect marine biodiversity.