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These beautiful tree snails are endemic to Sri Lanka. Acavus is a genus of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Acavidae. They belongs to group of tree snails that inhabited the ancient continent of Gondwana over 150 million years ago. . It is present a large intraspecific polymorphism, with the development of various geographical subspecies (among them Acavus phoenix phoenix and Acavus phoenix castaneus).