 Lake Malawi is home to 28 species of freshwater snails (including 16 endemics) and 9 bivalves (2 endemics, "Aspatharia subreniformis" and the unionid "Nyassunio nyassaensis").The endemic freshwater snails are all members of the genera "Bellamya", "Bulinus", "Gabbiella", "Lanistes" and "Melanoides".Lake Malawi is home to a total of four snail species in the genus "Bulinus", which is a known intermediate host of bilharzia.