Ratnadvipia irradians is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Ariophantidae. It is endemic to island of Sri Lanka.
Shell is thin and solid, color ranging from bright golden brown to greenish yellow. Apex obtuse. Lunate oval aperture is large, and very oblique. Foot pale.[1]
It is the most widespread of Sri Lanka's endemic land snails, which can be found in dry zone and intermediate forests and home gardens.