The IUCN has placed three species, all anchialine stygo-bitic mysids (Bermudamysis speluncola, Platyops sterreri, and Sty-giomysis hydruntina) on its Red List as Critically Endangered and another one as Vulnerable.
Regression or even complete extinction of mysid populations as a result of human impact has been documented. Mysids are endangered by domestic and industrial pollution of coastal waters; dredging of canals (for land use, fisheries, and navigation); artificial redirection of waters (for river traffic and dykes); groundwater drainage; and the repeated application of pesticides. Subterranean ecosystems are variously threatened by tourism, agriculture, urbanization, and the construction of hydroelectric reservoirs.
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