Threats to their survival include exploitation, pollution, habitat alteration or destruction, introduced species, and over-collecting.
After insects, molluscs are probably the most familiar invertebrate, with more than 100,000 species living and a long fossil history. Of all the invertebrates, molluscs are most valued by man; they are a major food source in many parts of the world, their shells provide a variety of products, and the diverse and beautiful forms that these may take have led to molluscs becoming important elements in the art, culture and traditions of many cultures.