Thiara

A widespread genus of operculate snails (family Thiaridae, subclass Prosobranchiata) found in fresh and brackish waters, chiefly in tropic and subtropic Africa and Asia. Thiara tuberculata is one of the initial intermediate hosts of the human lung fluke, Paragonimus westermani, and of several fish-borne heterophyid flukes of humans and fish-eating mammals.