Gocea ohridana
Gocea ohridana is a species of freshwater snail within the family Hydrobiidae,found in Lake Ohrid, North Macedonia, in a small area less than 10km2. It lives in rocky areas along the shores of Lake Ohrid, being found in sublacustrine springs underneath stones as deep as  below the waters surface. It faces threats such as deforestation leading to erosion that can impact the snails ability to filter water; pollution from sewage coming from major cities adjacent to the lake; and an increase in fire hazards in the region. Because of its strict range, low abundance in findings, and threats to its specific environment, it has been classified as a 'Critically endangered' species by the IUCN Red List. References 

Gastropods described in 1956
IUCN Red List critically endangered species
Endemic fauna of North Macedonia
Hydrobiidae