Three malacological surveys were conducted in the Takua Pa District of Phang-Nga Province, southern Thailand, before and after the Indian Ocean Tsunami disaster. Twenty-nine species of fresh- and brackish-water snails were found, in which 10 species of freshwater snails were present, including live Pila polita; 8 species were of medical importance. Two brackish-water snails, Nerita articulata and Littorinopsis scabra, were absent after the tsunami disaster, while brackish-water Cerithidea cingulata and C. djadjariensis harbored 9 types of trematode cercariae.
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