Data on the biology of Ratnadvipia karui are scarce.


The egg resembles that of other ariophantid genera such as Cryptozona and Euplecta. It is soft , translucent and white, oval in form with longitudinal sulcations, and measures 7 mm x 4 mm.


Data on the natural predators of these snails is sparse, but R. irradians is preyed upon by at least one reptile, the skink Eutropis carinata (Karunarathna and Amarasinghe, 2009).