Subterranean fauna

Subterranean fauna refers to animal species that are adapted to live in an underground environment. Troglofauna and stygofauna are the two types of subterranean fauna. Both are associated with hypogeal habitats – troglofauna is associated with terrestrial subterranean environment (caves and underground spaces above the water table), and stygofauna with all kind of subterranean waters (groundwater, aquifers, subterranean rivers, dripping bowls, gours, etc.).