Marine species tend to be more common than freshwater and terrestrial species, and are often less restricted in their distribution and less susceptible to disturbance. Ten freshwater members of the Neritidae and 23 terrestrial snails (17 Helicinidae and six Hydrocenidae) are listed on the IUCN
Red List. Many species are over-harvested for food, such as Strombus (queen conch in the Bahamas). Habitat destruction is the biggest threat to these species, with deforestation directly affecting terrestrial species and increased sedimentation load impacting freshwater species. Freshwater species are also affected by water diversion and reservoir projects, as well as pollution.
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